Complete Add grad_scale Op

Add a new grad_scale op to scale or inverse gradient in backpropagation.

uint16 added into _good_broadcast_binary_normal

theano.pp crash fix and display fix

Get rid of redundant copy for GPU "map" style scan

Add regression test for nvcc.compiler_bindir (#5373)

Bug: gradient of ifelse with gpu inputs

Fix the buildbot.

Mixed fixes

gpuarray: Revert part of c6ffa460

Select the dnn convolution algorithm using actually available memory

crash fix. Add the missing inputs to the function call. It also need the real data. I don't sync as we don't care of the values.

Fix cudnn init in the new back-end. Remove duplicate place where we store cudnn version at the same time.