1) Adding to cbook.py a method is_sequence_of_strings that is then used in
BlockingInput to test for a tuple-like sequence of event names
2) Modified the use of *fmt* in clabel so that it an also be a
dictionary matching contour levels to arbitrary strings.
3) Removing the extraneous np.array or np.asarray commands in ContourLabeler
as they were forcing linecontour to array, but linecontour should already
be an array.
4) In blocking_input.py replacing all print commands with calls to
matplotlib.verbose.report
5) Removing extra cleanup call from BlockingInput as finally is always
executed, regardless of exception status.
6) Removing what appears to be a "patch" command screwup - there were two
versions of several of the Blocking* classes in blocking_input.py
