Assert to never reintroduce Apply node in fgraph

C implementation of sample without replacement OP

Add debugmode implementation for abstractconv

Add lifter for IfElse.

Try to detect bug in nvcc.

small cleanup, update

Doc to check for easy fix issue as a good starter

Fix scan pushout

Fix small buildbot problems

We need to import gof.compiledir in theano-cache.

code doesn't work.

client checking.