[issue1524639] Fix Tkinter Tcl-commands memory-leaks

[Guilherme Polo]

Guilherme Polo <ggpolo at gmail.com> added the comment:

I've fixed the leaks in Variable doing this:
http://code.google.com/p/plumage/source/detail?r=93

I don't use an extra _tclCommands for Variable, instead in __del__ I use
the information returned by Variable.trace_vinfo to remove associated
callbacks.

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