postinstall/preuninstall scripts for RPM

Re,

I added some postinstall/preuninstall scripts to the RPM building process which we use in our automated environment. They automatically start/remove the diamond service upon installation/removal of the package. Think this is useful for anyone who uses RPMs.
Additionally I changed the runlevel priority in the init script to make sure diamond is started after mounting all filesystems.

Cheers
Robert