Add space for timming with cuda 6.5
This is done.
Don't try to use cuda op with opencl back-end.
Add GPU timming.
Change the default GPU 2d convolution.
Update doc
small doc/comment changes.
Fix test crash in FAST_COMPILE.

This allow to free the temp memory with the old linkers.
Fix test. It wasn't testing what it should.

This was causing a test failure in python 3.3.0, as cmp isn't a
built-in function anymore.
Make the error detection work with python 3.3.

It was making a test crash with python 3.3
Update conv.txt

Change date, minor updates.
Merge pull request #2192 from nouiz/mixed

Mixed