rewrite the buka extractor.
class BukaFile and ComicInfo, update readme.
BukaFile, ComicInfo, DirMan, buildfromdb and others.
DwebpMan and others. Beta vesion.
py3k warning, improve logging and exitcode.
some minor fixes
improve renaming.
add PIL/Pillow support. (not tested)
fix renaming and PIL detecting
Merge branch -> v2.0