This commit is the first step of the plan to make Theano imports compatible with 3.x:

1. Remove unnecessary imports.

2. Convert relative imports to absolute.

3. Fix circular dependency issues by either eliminating "from xyz" imports or moving them inside functions.

Cast indices to intp rather than intc.

The intent was correctly described in the comment - to cast to int32 on 32-bit machines and to int64
on 64-bit.  However, numpy.intc is not correct type to achieve that because it has the size of C int and
is 32-bit always.  The correct type is numpy.intp which is defined as "large enough to fit a pointer."

See http://docs.scipy.org/doc/numpy/reference/arrays.scalars.html .

Make compile_str able to compile a lib that is not a Python module

Added a verbosity flag to device_malloc.

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.