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Okay, here's a correction to the first patch.  It fixes the logic
bug that corrupted the HTML output.  It also adds a little bit
of extra documentation.

Writing the documentation made me think that perhaps this
should be added to the traceback module as Guido
suggested with just a stub cgitb module that provides an 
enable function that calls the enable function in the 
traceback module with format="html".  The cgitb module
could then be deprecated.