Various cleanup and optimization
- Deleted shameful dead code here and here...
- Accelerated creation of GenBitmap*Button adding some caching for bitmap grayOut
- Replaced lists inside type use dictionary by sets
- Prevented useless type usage checking when unnecessary
These classes are intended for use server-side.
e.g. in a django view.py :
from pyjs.jsonrpc.django import JSONService, jsonremote