[Bug-gnubg] Database interface

[Jon Kinsey]

I've just had a quick look at the new sql database code and have managed 
to get it working under windows.  I've used the public domain database 
engine sqlite, which implements a subset of SQL92.  The main thing used 
that wasn't covered was schemas, so I've changed my code here to not use 
"gnubg." in places.

I'm not sure about using python to access the database.  It wasn't a 
problem as there is a pysqlite module, I just don't think it's 
necessary.  To put it another way, it adds a dependency that isn't 
strictly required.  I imagine the code could easily be changed so that 
the database access is in the C layer and the python code changed to use 
this.  Is there any other reason to use python for this?

Jon