Fix cachelock

Set the file in the compiledir, not the case. Some user set the compiledir directly, not the base_compiledir and this make that sometimes, the base_compiledir isn't working.

It is a todo to find a better fix, but to don't cause probleme, here is a work around.

Shorter error

Minor fixes

Make sure preallocated output is contiguous before using it

Take the compiledir lock only if the op generate c code.

Make check_preallocated_output work on fct outputs

Also set Python Exceptions before failing.

grad method for GpuContiguous

fix a NotScalarConstantError issue

Add test for when b is not constant

To be able to use negative offsets in indexing, threadIdx.x (and y)
should be cast to signed int.

Issue #1193: Fixed theano-nose --batch.

It may be slower than allocated new memory and calling memset,
but if that non-contiguous memory was provided, it is probable
that the output will end up being copied into that non-contiguous
memory, and that would be even slower.

WIP: fix compilation problem for GPU on windows.

Small fixes for Python 2.4

Revert "Fix error in EPD when using Python from C"

This reverts commit 962d3b2d.

Fix error in EPD when using Python from C