Create auto overrides for adjectives

I left in a few hundred over-analyzed words, because I stopped caring.  They
seem to be mainly proper adjectives that have only one gender, and it didn't
seem worth it to further special case them.

The types of adjectives that were auto-overrided seemed like they were mostly
indeclinable adjectives and adjectives that had irregular stems.  Both of those
could probably be handled in create_lexica.py with just a little bit of work,
using existing code (like the verb-stem-change-detecting code, and the
feminine-noun-indeclinable-detecting code).