Here's a patch to cgitb that allows you to enable plain
text output.  It adds an extra variable to the cgitb.enable
function and corresponding underlying functions.  To get
plain text invoke it as

    import cgitb
    cgitb.enable(format="text")

(actually, any value for format other than "html" will 
enable plain text output).  The default value is "html", so 
existing usage of cgitb should be unaffected.

I realize this isn't quite what you suggested, but it 
seemed to me worthwhile to keep such similar code 
together.

I'm not entirely certain I haven't fouled up the html
formatting.  It needs to be checked still.  Also still to come
is a doc change.

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