[CRASH] Fix local_gpua_advanced_incsubtensor to return variable on the GPU

Fix local_gpua_advanced_incsubtensor to return variable on the GPU. op_lifer expect that. fix gh-5589

Prevent pkl_utils from stomping higher sys recursion limits

Use 64-bit indices in sparse.AddSD where necessary (fix #5525)

Scan fix

Prepare release 0.9.0rc1.

Fix reST nested lists syntax.
Fix typos.

Update .mailmap, then update count and list of contributors

[CRASH] Fix crash of GpuElemwise that have too many inputs

If there is no room for even 2 inputs, then it will fail rather than
loop endlessly.

Clarify error message related to expected kern_shape specs (1D, int64) in GpuDnnConvDesc

Clarify error message related to expected kern_shape in GpuDnnConvDesc make_node() method, and fix a related test in test_dnn.

Fix invalid pointer casts and negative stride handling in sparse

Fix crash due to excessive decref of 1

Fix compilation crash show by THEANO_FLAGS='floatX=float32,dnn.conv.a…

Fix `-Wl,rpath` parameter for Windows (fix #5463).

Do not decref borrowed references.