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.

Closes gh-414.

Remove the tuple argument unpacking which is deprecated in Python 3.

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