The problem was that when a Composite Op had a Composite subnode, having
the subnode return an empty support code would cause the parent node to
return '\n' as support code. As a result, GPU code generation would
crash due to non-empty support code.

Thanks to Fred for writing the associated test.

Make a machanism to don't have Alloc and GpuAlloc constant folded in som...

pep8 fix + added verbose exception

Small fixes

Add shape inference for sparse/basic.py Ops

A few PEP8 fixes, string formatting and cosmetic stuff.

more pep8 fixes

various other pep8 fixes so that being pep8 compliant doesn't take as
much time

Some more typo fixes & co

Cache

Fix reduce

dot() called on sparse matrices obeys 2D dimension matching rules,
even if they are single row/columns. dot() called on (1, N) and
(1, N) arguments, as was being done here, will fail. This transposes
the second argument to fix the problem.

Fixed issues with advanced inc/set subtensor in some cases