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For https://bugzilla.gnome.org/show_bug.cgi?id=689483 It seems there are functions that do use the const qualifier for some of the arguments, but it seems that there are a lot of functions that don't use it and probably should. So I created a patch against 2.9.0 that makes as much as possible const in tree.h, and changed other files as needed. There were a lot of cases like "const xmlNodePtr node". This doesn't actually do anything, there the *pointer* is constant not the object it points to. So I changed those to "const xmlNode *node". I also removed some consts, mostly in the Copy functions, because those functions can actually modify the doc or node they copy from
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