[xml] xmlURIEscape and user authentication

[Mark_Vakoc peoplesoft com]

xmlURIEscape seems to trample on the user part of a URI.  xmlSaveUri
assumes a http style uri (http://user somewhere com/) and doesn't work
properly for mailto type schemes, but for libxml2 that is probably ok.
However calling the following:

xmlUriEscape(BAD_CAST "http://user somewhere com") results in
"http:user@//somewhere.com".  The attach patch fixes that, but still does
not properly handle the mailto type scheme.  Again, probalby not a problem
for libxml2 and would be difficult to fix without adding lots of scheme
specific logic.


(See attached file: uri.diff)

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