Update FDD_MPE to allow for Nref=1

.flake8

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+[flake8]
+per-file-ignores =
+    __init__.py:F401
+max-line-length = 110
+safe = true
+skip-string-normalization = true
+ignore = E203,W503

.github/ISSUE_TEMPLATE/custom.md

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+---
+name: Custom issue template
+about: Describe this issue template's purpose here.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Desktop (please complete the following information):**
+ - pyoma2 version: [e.g. 0.1.0 or latest]
+ - OS: [e.g. iOS]
+ - Version [e.g. 22]
+
+**Additional context or possible solutions**
+Add any other context about the problem here.

.github/workflows/draft-pdf.yml

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+name: Draft PDF
+on: [push]
+
+jobs:
+  paper:
+    runs-on: ubuntu-latest
+    name: Paper Draft
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Build draft PDF
+        uses: openjournals/openjournals-draft-action@master
+        with:
+          journal: joss
+          # This should be the path to the paper within your repo.
+          paper-path: paper/paper.md
+      - name: Upload
+        uses: actions/upload-artifact@v4
+        with:
+          name: paper
+          # This is the output path where Pandoc will write the compiled
+          # PDF. Note, this should be the same directory as the input
+          # paper.md
+          path: paper/paper.pdf

.github/workflows/main.yml

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+name: Test Pyoma2
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  # pre-commit:
+  #   runs-on: ubuntu-latest
+  #   steps:
+  #   - uses: actions/checkout@v4
+  #   - name: Set up Python
+  #     uses: actions/setup-python@v5
+  #     with:
+  #       python-version: "3.11"
+  #   - name: Install pre-commit
+  #     run: pip install pre-commit
+  #   - name: Run pre-commit
+  #     run: pre-commit run --all-files
+
+  test:
+    # needs: pre-commit
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false  # Continue running jobs even if a previous job fails
+      matrix:
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        exclude:
+          - os: macos-latest
+            python-version: "3.8"
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Install tkinter for Ubuntu
+      if: matrix.os == 'ubuntu-latest'
+      run: sudo apt-get install -y python3-tk
+
+    - name: Install PDM
+      run: python -m pip install pdm==2.20.1
+
+    - name: Install dependencies (Linux)
+      if: matrix.os == 'ubuntu-latest'
+      run: |
+        if [ "${{ matrix.python-version }}" == "3.8" ]; then
+          pdm install --lockfile=pdm-py38unix.lock --without docs
+        else
+          pdm install --lockfile=pdm-py39+unix.lock --without docs
+        fi
+      shell: bash
+
+    - name: Install dependencies (macOS)
+      if: matrix.os == 'macos-latest'
+      run: |
+        if [ "${{ matrix.python-version }}" == "3.8" ]; then
+          pdm install --lockfile=pdm-py38macos.lock --without docs
+        else
+          pdm install --lockfile=pdm-py39+macos.lock --without docs
+        fi
+      shell: bash
+
+    - name: Install dependencies (Windows)
+      if: matrix.os == 'windows-latest'
+      run: |
+        if (${{ matrix.python-version }} -eq "3.8") {
+          pdm install --lockfile=pdm-py38win.lock --without docs
+        } else {
+          pdm install --lockfile=pdm-py39+win.lock --without docs
+        }
+      shell: pwsh
+
+    - name: Run tests
+      run: pdm run pytest
+      continue-on-error: false
+
+    - name: Set job status
+      if: failure()
+      run: echo "job_status=failure" >> $GITHUB_ENV
+      shell: bash
+
+  check_failures:
+    # needs: [pre-commit, test]
+    needs: [test]
+    runs-on: ubuntu-latest
+    if: always()
+    steps:
+      - name: Check for failures
+        run: |
+          if [[ "${{ contains(needs.*.result, 'failure') }}" == "true" ]]; then
+            echo "One or more jobs failed"
+            exit 1
+          else
+            echo "All jobs succeeded"
+          fi

.github/workflows/python-publish.yml

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+# This workflow will upload a Python Package using Twine when a release is created
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python#publishing-to-package-registries
+
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+
+name: Upload Python Package
+
+on:
+  release:
+    types: [published]
+
+permissions:
+  contents: read
+
+jobs:
+  deploy:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Python
+      uses: actions/setup-python@v3
+      with:
+        python-version: '3.x'
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install build
+    - name: Build package
+      run: python -m build
+    - name: Publish package
+      uses: pypa/gh-action-pypi-publish@27b31702a0e7fc50959f5ad993c78deac1bdfc29
+      with:
+        user: __token__
+        password: ${{ secrets.PYPI_API_TOKEN }}

.github/workflows/templates/bug_report.md

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+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Desktop (please complete the following information):**
+ - pyoma2 version: [e.g. 0.1.0 or latest]
+ - OS: [e.g. iOS]
+ - Version [e.g. 22]
+
+**Additional context or possible solutions**
+Add any other context about the problem here.

.github/workflows/templates/feature_request.md

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+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/workflows/templates/question.md

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+### Description
+Provide a clear and concise description of your question or issue. Please ensure it's related to the usage of the library.
+
+## QA
+
+### Context
+Include any relevant context about your question or issue. For example, if you're encountering an error, provide details about when it occurs and any steps you've already taken to troubleshoot.
+
+### Code Example (if applicable)
+If your question involves code, please include a minimal example that demonstrates the issue:
+
+```python
+# Your code snippet here