Make user:search case-insensitive about openipam HOT 1 CLOSED

Database constraints have been added on our db to prevent upper/lower 
conflicts. 
get_users and get_groups have both been modified to be case-insensitive for 
names.

Usernames are still allowed to have whatever case is desired, and that is 
stored in
the database, but anywhere a comparison is done it is done with lower(username) 
(same
for group names).

Our database schema on our database is out of sync with our schema in the repo. 
 We
should probably go through and find the differences sometime.

I'm not sure what was meant by 'Find a good way to deal with sources of users,
whether they are from LDAP, internal, or some other source." means.  Currently, 
the
DB won't let a username be duplicated, even if it might be from multiple 
sources.  Is
that what you are referring to?  If so, it should probably go in a different 
ticket.