Users/Groups -> Roles

Greetings,

Attached please find files and patches associated with moving from the
User/Group system currently in place to Roles, as discussed
previously. The files are:

pg_authid.h
New system table, contains role information
To be placed in src/include/catalog, replacing pg_shadow.h

pg_auth_members.h
New system table, contains role/membership information
To be placed in src/include/catalog, replacing pg_group.h

role_2005062701.ctx.patch.bz2
Main patch, generated via cvs -z3 diff -c | bzip2
(gzip didn't quite get it under the 100K mark for the list)

role_milestones
List of milestones associated with my work on Roles support
'*' indicates that the milestone has been met/completed
'?' indicates uncertainty about if something should be done
No marker indicates an item which needs to be done
Note: Documentation needs to be updated

Again, my apologies for not getting this in sooner, it's been a little
hectic around here of late. I'm anxious to get feedback, comments,
corrections, etc.

Thanks,

Stephen