Some sites sloppily leave a space in their doctype
declaration:  i.e. <! doctype...>. The Python 2.1 sgml
parser raises an exception for this.  This patch
modifies sgmllib.py to allow leading whitespace in the
declaration.  It also adds a little information to the
exception message.

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I don't have an SGML spec, so I can only check the XML 
spec. In XML, such a DOCTYPE declaration is ill-formed; I 
expect the same to be true for SGML. Therefore, I 
recommend to reject this patch.

If you have a need to process such ill-formed documents, I 
recommend to derive from SGMLParser and replace 
parse_declaration appropriately. E.g. you could advance i 
until after the space, then call the base method.

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I have already overloaded parse_declaration. I will withdraw
the patch. However, I would like to make one final comment.

<rant>
A rigid interpretation of the RFCs is correct in servers,
but clients should be as flexible as possible, to handle
real servers.  Our system (http://www.stressmy.com) uses
heavily overloaded versions of sgmllib, httplib, and other
Python library modules because while they may adhere here to
some notion of academic purity, they just don't work very
well against real websites.
</rant>

Whew, I feel better now.