Pass the right variable when not working inplace.

The corresponding CPU test does the same

[BUG,CRASH] Fix crash in GPU advanced indexing with no arrays

minor fix to test_nnet.py

Add sigmoid_binary_crossentropy function

Add magma gpu svd and matrix inverse

Update libgpuarray version in the doc

Magma expect column-major matrices. Exchange u_data -> VT and vt_data -> U to
match numpy svd interface.

Added an optimization for inplace gpu_cusolver_solve and tests

Add on_error option for Cholesky

Fix more issues in DebugMode