Merge 'trunk' into 'multi_stuff'

r5540@rkinyon-lt-osx (orig r5539):  jmmills | 2009-02-19 22:27:41 -0500
Modfied isa() check in set_from_related() to use class name returned from relationship_info() rather than class() accessor on object. This fixes an issue when using with Catalyst::Model::DBIC::Schema.