Enable opt in NanGuardMode. Make it use the default optimizer.

fixes #3556: more robust determination of python library name 

add missing return to GpuFromHost R_op

Fix a test on GPU with mode=FAST_COMPILE

Mostly tests fix for 32bit python

Renamed BatchedDotOp to GpuBatchedDot

Fix typo in docs

[WIP] add bessel0

Fix doc gen

debuging > debugging

Fix path for BatchedDot

WIP: BatchedDotOp

Fix most of the remaining DeprecationWarnings in the tests.

Add 'half' padding to GpuArray dnn convolution