Make all models available via db.m.*
Make all models available via db.m.*

This makes it unnecessary to import common models and thus reduces the
amount of dependencies between python modules.

indico/indico,indico/indico,ThiefMaster/indico,mvidalgarcia/indico,mvidalgarcia/indico,indico/indico,mvidalgarcia/indico,DirkHoffmann/indico,DirkHoffmann/indico,pferreir/indico,ThiefMaster/indico,mic4ael/indico,DirkHoffmann/indico,OmeGak/indico,indico/indico,mic4ael/indico,pferreir/indico,ThiefMaster/indico,mic4ael/indico,mvidalgarcia/indico,mic4ael/indico,ThiefMaster/indico,OmeGak/indico,DirkHoffmann/indico,OmeGak/indico,pferreir/indico,OmeGak/indico,pferreir/indico