Fixed issues with advanced inc/set subtensor in some cases

The initial bug that motivated this fix was a crash when trying to
perform x[y] = z with x a matrix and z a vector.

Minor stuff (PEP8 and typos mostly)

Mixed

Cleanup of sparse/basic.py

Fix defaults

fixed debugging and warning messages (grammar and semantics) for cudandarray

previously, it stored the initial value of shared variables in defaults
this wasted a lot of memory
now it does not

Minor stuff

ndarray