Use verbal driver names in configuration files

Patch by Jano Svitok <jan.svitok@gmail.com>

Orig message:
This patch allows driver names to be used in the configuration file. The
old way (using numbers) is kept. Configuration file is converted to
names and the entries are properly aligned.

git-svn-id: svn+ssh://ffado.org/ffado/trunk@2345 2be59082-3212-0410-8809-b0798e1608f0