[xml] Indent support to xmlWriter

[Lucas Brasilino <brasilino recife pe gov br>]

Hi!

        I'd like to know if someone is working on ident support to
xmlWriter. Alfred?!?! :)
        Seems not to be difficult to implement. Although there's
indent at struct _xmlTextWriter, that looks like some ideas on it,
think the better aproach is calling xmlListSize() to get serialized
elements quantity and write out proportional spaces number.
        If nobody currently working on it, I'll try to implement this
next week, 'cause today is our Christmas party here at work :)

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[]'s
Lucas Brasilino
brasilino recife pe gov br
http://www.recife.pe.gov.br
Emprel -        Empresa Municipal de Informatica (pt_BR)
                Municipal Computing Enterprise (en_US)
Recife - Pernambuco - Brasil
Fone: +55-81-34167078