backend: add AVP support
backend: add AVP support

Load a new psycopg2 module to correctly handle hstore => dict conversion
and vice versa.

plajjan/NIPAP,ettrig/NIPAP,bbaja42/NIPAP,SoundGoof/NIPAP,SpriteLink/NIPAP,fredsod/NIPAP,fredsod/NIPAP,garberg/NIPAP,fredsod/NIPAP,bbaja42/NIPAP,SoundGoof/NIPAP,SpriteLink/NIPAP,SpriteLink/NIPAP,garberg/NIPAP,SoundGoof/NIPAP,garberg/NIPAP,fredsod/NIPAP,bbaja42/NIPAP,ettrig/NIPAP,bbaja42/NIPAP,ettrig/NIPAP,bbaja42/NIPAP,ettrig/NIPAP,SoundGoof/NIPAP,plajjan/NIPAP,SoundGoof/NIPAP,plajjan/NIPAP,fredsod/NIPAP,plajjan/NIPAP,ettrig/NIPAP,plajjan/NIPAP,SoundGoof/NIPAP,SpriteLink/NIPAP,bbaja42/NIPAP,fredsod/NIPAP,plajjan/NIPAP,SpriteLink/NIPAP,garberg/NIPAP,garberg/NIPAP,SpriteLink/NIPAP,garberg/NIPAP,ettrig/NIPAP