merge: telepathy-gabble

Merge to:

  telepathy-gabble

Changes:

  Simon McVittie <simon.mcvittiecollabora.co.uk>
    Document TpHeap

  Simon McVittie <simon.mcvittiecollabora.co.uk>
    In test-heap, pass NULL destructor to tp_heap_new

  Simon McVittie <simon.mcvittiecollabora.co.uk>
    Add destructor to heap.h too

  Simon McVittie <simon.mcvittiecollabora.co.uk>
    TpHeap: add destructor, used when we destroy or clear
the heap - this breaks API, but hopefully no released
versions of CMs are using it (tp-sofiasip doesn't)
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