PostgreSQL support

[Felix J. Ogris]

Hi,

I've published two patches which enable Cyrus imap and sasl to use the
postgresql database as backend for mboxlist_db, quota_db, and
authentication. You might download them from http://www.ogris.de/cyrus/.
Unfortunately I was too lazy to patch the configure script and Makefile.in.
So after applying these patches you have to call configure with
LDFLAGS="-lpq" or even with appropriate CFLAGS & LDFLAGS if your postgresql
headers and libs are in a non default location (sorry for that).

Felix
PS: Feel free to import my patches into the main distributions :-)