Added extend option to lasso.
also...
- selecting bones wasn't checking their layer of if they were hidden in a number of places.
- fixed memory leak.
small unrealed changes
- added PBONE_VISIBLE macro
- renamed functions used for paint selectoin from *_tface to paintface_*. sine they no longer have anything todo with tface's.
- removed scanfill include from BLI_blenlib.h, this is only used in very few places and quite specific.
Noticed lasso select is broken for metaballs and face mask mode but this has been the case for a while, will look into it next.
6b767b8018