[Csync2] Working on database abstration layer and mysql support

[Dennis Schafroth]

Hey, 

I am working on a patch to introduce a simple database abstraction layer, so it will be easier to introduce alternative databases. I also have the a basic mysql version (almost) working, it has crashed on a OpenSuse box, but worked on my Fedora boxes.

If there are any brave volunteers, that wants to try, let me know. It wont be clean at the moment. 

cheers, 

:-Dennis Schafroth