Merge 'trunk' into 'DBIx-Class-current'

r9088@obrien (orig r1305):  matthewt | 2006-03-22 11:52:30 +0000
Nuked ancient and unused classdata entry
r9091@obrien (orig r1306):  jguenther | 2006-03-22 18:16:27 +0000
fixed unclear documentation regarding context in txn_do()
r9092@obrien (orig r1307):  castaway | 2006-03-22 22:41:38 +0000
Fix up is_auto_increment doc

r9093@obrien (orig r1308):  castaway | 2006-03-22 22:46:30 +0000
Fixup sequence docs

r9100@obrien (orig r1315):  wdh | 2006-03-23 18:02:43 +0000
add basic cache tests/docs to trunk