Previous code identified Windows 64 as 32-bit.

This should really be maxsize, but under linux and win32, both values are
equal. That is not the case for win64, though.

TODO: Maybe remove the special case for maxsize in slices, since no
new slice with maxsize should be produced anymore.

When calling t[1:], for instance, the arguments passed to __getslice__ are
(1, sys.maxsize), which is a pain to deal with, and can even not be an int
(but a long).

If __getslice__ does not exist, __getitem__ is called instead, with argument
slice(1, None, None), which is much more desirable.

__getslice__ is deprecated in python 2.6 anyway.

Crash fix

fix theano import crash on computer without gpu when theano flags device or init_gpu_device start with gpu.

Link blas to epd library correcly on windows.

Sparse

Remove use of sys.maxint in slices.

Sparse

vars with broadcastable dims were being disallowed unfairly from being update exprs

Added MulSD, AddSS optimizations and new blas function declerations to sparse sandbox

Remove the useless Avanced[Inc]Subtensor args and added missing fct.

Fix blas

Minor fixes