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

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

r12251@localhost (orig r2961):  ningu | 2006-12-09 14:39:02 -0600
- die in Storage::DBI::Pg when it can't find the autoinc sequence
r12253@localhost (orig r2963):  ningu | 2006-12-10 10:25:22 -0600
add test for has_many prefetch with adjacent rows with no rel objects
r12254@localhost (orig r2964):  ningu | 2006-12-10 10:26:59 -0600
whoops
r12255@localhost (orig r2965):  blblack | 2006-12-10 19:00:22 -0600
allow pk mutation via column accessor + update
r12316@localhost (orig r2966):  blblack | 2006-12-11 08:24:23 -0600
better fix for pk mutation based on mst irc conversation