All the boiller plate code to allow using the run time maximum number of theads on the dimensions 0 of gpu block of threads.

Fix advanced indexing with constants (not variables)

Closes gh-607

fix test in float32, but also check float64 at the same time.

Disable ConvOp grad when subsampling is not 1 or 2

Subsampling seems to work with 1 and 2, but gives incorrect
results for (3, 3) and (1, 3).

Fixes to argsort when axis is None.

Set stride to 0 on length-1 dimension in subtensor

If a CudaNdarray has the right shape to be used as storage for a
broadcastable Variable, its stride should be 0.

Closes gh-597.

C code cache version

Added tests to check that we free all intermediate results on the gpu.

Instructions for manual Win 64 installation

This is needed to be able to version the CURAND op and all other op that have a generic in its input.

This is needed to cache the c code.

Test fix

Make CLinker use preallocated output memory