kwfmatcher first check for commit

Incorporate changes in self_initializing_hook branch Implement configurable expansion based on Mercurial templates. NOTE: Relying on pretxncommit-hook to write in working directory might break in the future as it relies on a buggy race condidition. [issue273]

Omit keyword argument for filelog __init__ Make keyword compatible with future changes in Mercurial. Should be safe and backwards compatible as well.