Merge 'trunk' into 'DBIx-Class-resultset'

Merge 'trunk' into 'DBIx-Class-resultset'

r4570@obrien (orig r392):  castaway | 2005-12-14 14:22:23 +0000
Patches from Andreas Hartmeier applied to PK::Auto

r4601@obrien (orig r396):  marcus | 2005-12-15 15:59:43 +0000
make more sane error message for missing table.
r4632@obrien (orig r397):  bluefeet | 2005-12-15 17:07:45 +0000
Adding first version of DBIx::Class::Validation.
r4633@obrien (orig r398):  ningu | 2005-12-15 22:59:01 +0000
- PK::Auto doc patch from dwc
r4641@obrien (orig r400):  dwc | 2005-12-18 17:59:04 +0000
Update examples to be more explicit about load_components order

r4642@obrien (orig r401):  bricas | 2005-12-19 20:19:14 +0000
added cookbook example: setting default values