Should have a testable flag to show if simulator is MOOSE

Created by: subhacom

Logged In: YES user_id=1525879 Originator: YES

This was tricky, because if we want it to be a flag, it should be something that GENESIS could also do, and we aren't fixing up GENESIS. Solution was to take the existing 'version' function, which returns a float with the version of the simulator. Somewhat optimistically, I have now added the version function to MOOSE to return 3.0.