Unit test for 2nd table in same db file.
Add test checking how working with multiple tables.
Currently fail when several tables are used in the same sqlite file.
This causes problems for plinth.
Check table is created for every new instance.
Merge pull request #2 from petterreinholdtsen/test_multi_table

Add test checking how working with multiple tables.
Merged: jvalleory's Fix to allow more than one table to be used in same db file.

Used the old test, as that one succeeded.