let git ignore some more files
on purge, also remove /etc/bareos/.rndpwd

Closes: #769096 (https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=769096)
Thanks: Andreas Beckmann
get rid of circular dependencies

Remove circular dependency between bareos-database-common, bareos-database-mysql, bareos-database-postgresql and bareos-database-sqlite3.

Closes: #769536 (https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=769536)
Thanks: Bill Allombert
set Debian section to python for Python packages
fixes usage of dbconfig-common when installing