Pybind11 todos

[cissieAB]

For v0.2.x

• Test the pybind11 methods which are not included in the Jupyter notebooks or testing scripts.
• LBManager docs

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Good stuff to have:

• Bridge numpy and C++ DP
• Port E2SARException to Python

[ibaldin]

Ported E2SAR Exception to python as part of v0.2.1. Made some improvements to testing.