BF: Fix AttributeError on error in MovieStim

Not available logging.Error() was called instead of logging.error().

Found by pylint.
BF: Fix NameError in filters.makeGrating()

Not available Float was used instead of type float.

Found by pylint.
BF: Fix AttributeError and NameError

There were typos in what seems to be an unused class.

Found by pylint.
ENH: Fix typos in docstrings
DOC: Fix duplicate words in documentation