Add keyword; comment backwards compatible import

Implement self initializing pretxncommit hook This is more expensive than overriding commit(), but a) uses more "official" interface b) less code c) easier to maintain Get all changes up to cee5fef33cf8 in here as well.

Fix timezone expando in doc

Make changes from last cset 474b415433a1 available to 0.9.3

Unexpanded storage hopefully covered now by adding kwfilelog.add (again!) All filelog methods that act on text/data should be consistent. Principle: read expanded kw's; unexpanded kw's for "internal" workings. kwfilelog.iskwcandidate() to check whether keyword action required. More doc.

Check against keyword config in kwfilelog.cmp; be silent in kwfilelog (0.9.3)