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.