#1 SQLite code is buggy

[Jakub Hrozek]

The code that handles SQLite backend is buggy and not in best shape in overall as a result of rushing for the project deadline.

I suggest that we do:
i) a design of the database and discuss it - maybe we could file a separate bug
ii) merge todo and dbElement objects to avoid hacks like elem2todo and vice versa
iii) rewrite the db.py code from scratch

One thing I can think of right now is use some DATETIME SQL object and not the string. This way, we could get move some logic from the python code to the db code.