#90 Housekeeping: reorganize cards in categories and databases

[Christa Runge]

The following features were requested by our user arutgers03 (see his forums entry on 2010-01-26):
"... Unfortunately I didn't set up databases and categories in the best way from the beginning, and now the organization is quite out of hand. Could the following features be implemented to that end?

-Move cards between categories and databases
-Merge/split categories
-Merge/split databases"

And the response by kussinger:
"I see this kind of housekeeping as a functionality of the Java GUI i'd like to have,
there is much more screen space for complicated user interaction. "