Add reduction based on cudnn.

speed up tests, fix compiledir cache crash and old unpickling.

Added the tri-gamma function.

Params for Gemm, CGer, CGemv

Gradient for matrix pseudoinverse

Work around erroneous dnn_conv results with algo small an large batches

Buildbot testsuite names

removed part of _optcheck_fgraph and called std_fgraph instead

(replace algo `small` by `none` if necessary).

the arguments.