Ai dev

[zetwal]

Adding the genesis demo to the examples folder and code changes I made for the URSA-DSI-DIANA agents.

The main code changes and reasons are as follows:

• changed from .temp.db to .temp_dsi.db: it makes it more clear that the temp database belongs to DSI and not something else
• replaced sys.exit() by raise exception for a couple of cases: I feel that DSI should only exit when it's a really bad failure that demands that the sytem halts and not because of a bad query, the table has no data ... . I only made the changes that I needed for the agents but I feel that this should apply in other places too.