[xml] Format/indent w/libxml2

[Fatih Demir <kabalak gtranslator org>]

If I write a normal XML document via libxml2 it isn't well indented. I
do get output files like the one attached.

This isn't quite normal I guess; do I have to call any special function
during the document creation/saving to get indented documents?

PS: It's all about Semerkent (CVS module semerkent): Everytime I create
xml documents with libxml2 I do get such "messed" XML documents..
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