-side effect, the cuda test are not enabled by default, will be on the build bot.
-also, now the use fct don't have a default value.

lower profiler overhead by moving computation into the printing phase instead of the recording phase.

Usefull to track the overhead of theano fct call.

Committing before actual changes take place.

THEANO_FLAGS and THEANORC environment variables are now right-dominant (right-most definitions have precedence over the ones on their left)