Also fix error that was causing compilation cache to fill up.

We should pass the Mode objects instead.

We should use, for instance, "linker=cvm_nogc", not "mode=CVM_NOGC".

Also get rid of all those debug(), info(), warning() and error() functions
defined everywhere.

In the past it was warned when we load theano.sandbox.cuda.

Consecutive calls of the the join op ( during the optimization phase) get
the axis as a constant. What used to happen was that in such cases Theano
would not use that constant to define its broadcastable pattern.