Py3k fixes

Canopy/GpuMin/compiledir_format/ScalarOp.c_support_code/...

dot22scalar can't use the dot22 index for the scalar!

This happen when we list only folders without tests to run.

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