so we have a (as suggested by ossi in June) KConfigFileBackend in order to make KConfigBackend less "file" dependent.
KConfigINI now inherits KConfigFileBackend

I have also changed some functions names to match a more generic concept of namespaces instead of pure "files" (this still is not really great since KConfig is used to open files by full path name apparently -think of icon theme configuration file for example-)

KConfig also has a setFilePermission function that needs to be removed (was does FilePermissions means for a DB ?) (not used anywhere in KDE)

probably lots of other stuff I forgot, but you'll find your way in the code ;)

and, the SQL backend, just a basic sqlite one for now (not even checking for locks/nb of connexions/... etc)

till now, I was able to get kconfigtest to success all tests with the DB backend, and was able to run kwrite, modifying options etc

there are stills major things to fix :)
feel free to comment and help