Xfconf 4.7.2

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  * Disable cache singletons and improve some code now we know the
    tree is always empty during prefetch. This is only a disadvantage
    when creating multiple new channels with the same name, but
    in that case channels singletons should be used.
  * Lots of memory leaks plugged. Valgrind log is clean now.
  * Fix memory corruption during file loading and use mmap.
  * Properly handle dirty channels in the daemon and avoid excessive
    saving of channels.
  * Disable unimplemented code in the properties cache.
  * Steal values during cache prefetch to avoid a lot of copying.
  * Updated translations: hu.