Remove deprecated stuff

Make scan opt before blas opt.

Fix neibs

Spectral radius bound review

Depricated scan

They should not have been used anymore as they should have been removed already.

Was accepted only in theano.function in the mode argument. Not as a theano flags.

When tring to make the grad raise an Exception with an error that the old version returned wrong answer.

Ensure sorted indices reviewed

Fix default axis for tensor.roll

In the case of a default axis argument and a 1-d tensor, don't create
flatten and reshape nodes that need to be optimized out when it's simple
enough not to do so.

NumPy docstring standard compliant. Nearly identical to the numpy.roll
docstring.

Elegantly solved with a recursive call.

added roll function and test

small fix to gpusum. It can happen that we start 2 reduction at the same time

added roll import to tests

fixed pep8 issues

Better pushout optimization

Note that I only went through the files and fix whatever the PEP8 script for
vim reported as incorrect, but I had not actually paid attention to the
text, so there might still be inconsistencies (like for example strange
variable names, etc.). Also only scan_opt.py is done completely, scan_op.py
still has a bunch of PEP8 inconsistency.

After the fix I only run the tests in scan_module/tests.py and they passed
so I assume I had not introduced any bug in my PEP8 fixes.