This should make it easier to hack, and also to separate out the tangled in
third party EvolutionarySolver as/when we can.

Add genitive and partitive month names and remove hardcoded case
suffixes from predefined date formats. One format incorrectly
had case suffixes added to abbreviated month names.

Removed some redundant "this->", sbergman@redhat.com.

This speeds up importing unicode text a lot. Results of a sample of
chinese text of 5 pages:

- before: 18.351s
- after: 6.692s