Fix a memory leak in theano

Use E_PADSHAPE flag in GPU Incsubtensor

ExtractDiag cleanup #5633

Make it more clear error when not enough GPU memory. fix gh-6397

test MRG random stream with device=cuda and target=cpu

Fix unit tests for CEnumType.

Gpu stack follow up

This should expose an issue in GpuIncSubtensor

Improve tests for meta-optimizer

Update introduction.txt

Make test pass in Python 3

Links outdated.

Move the test to the GPU directory and mimic device=cuda in another test following the current change.

Added documentation for ExtractDiag (copied from https://docs.scipy.org/doc/numpy-dev/reference/generated/numpy.diagonal.html)

- Added ValueError exception
- Remove failure test for tensor3

Scipy nfunc

test MRG random stream with device=cuda and target=cpu, shared variable + computation in a real model stay on CPU. #6382