Fix tests in DebugMode with DNN convolutions

Add the same restriction to the perform to return the same error and …

Add the same restriction to the perform to return the same error and have test don't use more then 9G of RAM.

Fix windows test failures

(nit) sparse tutorial typos

Manually set cuda_ndarray.__file__ if it is absent

Fix the bilinear tests in float32.

Fix test for release when scipy isn't there.

Python 3 does not necessarily set __file__ when importing, and it happens
that it is not set on my system (Windows 10, Python 3.4) and causes an
exception.

Fix the last problems identified for the release.

flake8 compile/tests/*.py

Fix windows test problems.

Test files have been modified in order to respect the flake8 style.

Opt fix

Cnmem threashold, comment, don't call dnn_version and optimization registration.

Pass -rpath to linker only, not to compiler