BibMatch: improves get_longest_words
- Improves the function get_longeset_words in order to be more robust in regards to words in between quotation marks.
- Adds unit-tests appropriate for this function.
Co-authored-by: Kirsten Sachs <kirsten.sachs@cern.ch>
Reported-by: Kirsten Sachs <kirsten.sachs@cern.ch>