[CRASH] Error when scan has only nonseq inputs

Crash fix

Speed up local useless subtensor

Enable algorithm selection in cudnn convolution

Fix cudnn crash with v1

Canopy win

Activate add_no_output_from_inplace optimization by default in scan's inner function

Windows documentation

[CRASH] Fix crash with broadcasted increment in AdvancedIncSubtensor1 and added test

Move values_eq_approx_remove* methods to functions

Move values_eq_approx_remove_inf, values_eq_approx_remove_nan, and
values_eq_approx_remove_inf_nan static methods to top-level functions
to fix pickling error that occurred during parallel sampling with PyMC
(https://github.com/pymc-devs/pymc3/issues/660).

Fix advincsubtensor grad crash

Code simplification/small speed up for downsample