Accomodate oversized text notes in PDF exporter

[kfatehi]

This issue is a fresh start to #17

Problem

Oversized text notes get cut off (or bleed?) or are otherwise unsupported on the current hard-coded 4-page PDF note layout. We don't want users to have data loss when they cross medium to paper so this needs to be solved.

Example solution for the algorithm

if lines_to_write > lines_that_fit_in_text_box {
  pdf_being_created.insert_after_current_page(single-page-version)
  return "This note is oversized and has been printed on a later page."
}

Use Frank!