The kron operation use existing basic function(available on the
GPU). Reusing them is faster then the scipy version, as the scipy
version end up coping the data twice. We copy it only once in the
reshape. We now also support it when the inputs ndim != 2 as scipy.

This make this test work. It was crashing during the compilation:

THEANO_FLAGS=device=gpu,floatX=float32 theano-nose theano/tensor/tests/test_basic.py:PsiTester

Py3k Fixes Bugfixes

This locals() wasn't inside a list comprehension and was also replaced
incorrectly.

StringIO was moved in python 3.

Rebase2

Instead of non-portable symlink from NEWS.txt to doc/NEWS.txt

It is intended to be ran by users so there is no reason to not have it executable

Py3k Fixes Part 2

Fixes for python 3 compatibility.

This is needed as a previous commit changed some python int to numpy integer.

This will also make the optimization happen more frequently then before.