[Pythoncard-users] explicit import statements completed

I completed the explicit import conversion and checked everything into cvs.
I would appreciate feedback from anyone with access to cvs before I do a
release. I've checked most of the samples and they seem to work correctly as
do the debug windows.

I also changed all local variables that conflict with a module name (e.g.
"event" to "evt"). I may have missed some, so I'll keep testing myself as
well to see if anything is broken.

Hopefully, the code is easier to follow now since there are no ambiguities
with the classes in the framework.

I did not change the samples to use explicit imports, so they still contain
stuff like

from PythonCardPrototype.log import Log

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