The DB2 connection string with DSN does not work anymore.
In version 1.94.6 (but the problem may exist for earlier versions
too), the uri is checked with a regex_dbname to force
<name_of_the_driver>://<parameters>.
However, for DB2 odbc driver with DSN, the syntax used to be
db2:DSN...
The problem is that when changing it to "db2://DSN..." to comply
(which is more coherent, I agree), the driver does not work because
the uri is not split correctly.
My guess is that line 2277 of DAL.py should be cnxn = uri.split('://',
1)[1] instead of current cnxn = uri.split(':',1)[1].
