[gxml] (18 commits) ...test/{Text, GXml, Element, CharacterData}Test.vala: because owner_document is a weak reference now, we

[Richard Hans Schwarting <rschwart src gnome org>]

Summary of changes:

  ef2edbe... * update libvala dependency from 0.16 to 0.18
  ebc3854... * update NodeList for changes in Traversable interface
  73c5d32... * factor out printing of an object's properties for debuggi
  3f1568e... * add a test for serialising/deserialising TreeSets
  4c54f3d... * merging with origin
  22e1bbd... * update the libxml-2.0.vapi file to include changes in the
  78fc135... * libxml-2.0.vapi: update dump_format signature
  affe6df... * try using an xmlList to track unattached nodes and free t
  ec0bdc5... Revert "* libxml-2.0.vapi: update dump_format signature"
  5c4f2c9... * re-commit dump_format commit
  e8a029e... Revert "* try using an xmlList to track unattached nodes an
  e7b2758... Document.vala, libxml-2.0.vapi: free xmlDoc and Element xml
  2b6a39c... Document.vala: close the Xml.TextReader and Xml.SaveCtxt to
  d927ac4... examples/vala/Makefile: include debugging symbols
  579e731... DomNode.vala, NodeList.vala: make references to Document we
  6f03bd2... libxml-2.0.vapi, Attr.vala, Document.vala, Element.vala: st
  15bf4f1... Element.vala: fix issue with freeing xmlAttr memory; don't 
  88b4db9... test/{Text,GXml,Element,CharacterData}Test.vala: because ow