Merge 'filter_column' into 'trunk'

Merge 'filter_column' into 'trunk'

r9147@Thesaurus (orig r9134):  frew | 2010-04-13 16:54:24 +0200
branch for FilterColumn
r9148@Thesaurus (orig r9135):  frew | 2010-04-13 18:09:57 +0200
change names wrap accessors
r9158@Thesaurus (orig r9145):  frew | 2010-04-14 17:55:14 +0200
basic tests and a tiny fix
r9159@Thesaurus (orig r9146):  frew | 2010-04-14 19:30:46 +0200
working filter column impl
r9160@Thesaurus (orig r9147):  frew | 2010-04-14 19:31:18 +0200
useless var
r9161@Thesaurus (orig r9148):  frew | 2010-04-14 20:10:57 +0200
MultiCreate test
r9163@Thesaurus (orig r9150):  frew | 2010-04-14 20:22:10 +0200
test db in MC
r9178@Thesaurus (orig r9165):  rabbit | 2010-04-14 23:35:00 +0200
Not sure how this was never noticed, but it definitely doesn't seem right and all tests pass...
r9191@Thesaurus (orig r9178):  frew | 2010-04-15 06:34:16 +0200
better namiology
r9193@Thesaurus (orig r9180):  frew | 2010-04-15 16:14:28 +0200
method and arg rename
r9194@Thesaurus (orig r9181):  frew | 2010-04-15 16:35:25 +0200
use result source for filtering instead of result
r9195@Thesaurus (orig r9182):  frew | 2010-04-15 17:04:38 +0200
initial stab at incomplete docs
r9278@Thesaurus (orig r9265):  frew | 2010-04-28 22:05:36 +0200
doc, removal of source stuff, and Changes
r9324@Thesaurus (orig r9311):  frew | 2010-05-06 01:49:25 +0200
test caching
r9327@Thesaurus (orig r9314):  rabbit | 2010-05-06 16:30:36 +0200
Play nicer with lower-level methods
r9328@Thesaurus (orig r9315):  frew | 2010-05-07 04:27:18 +0200
no filter and inflate column
r9352@Thesaurus (orig r9339):  rabbit | 2010-05-10 13:40:00 +0200
Maintain full coherence between filtered cache and unfiltered results, including store_column
r9353@Thesaurus (orig r9340):  rabbit | 2010-05-10 13:40:48 +0200
Fix typo
r9357@Thesaurus (orig r9343):  rabbit | 2010-05-11 16:45:50 +0200
Comment weird looking code