Added presence federation algorithm.#14

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dsandras wants to merge 10 commits intoOpenSIPS:1.8from

dsandras:ds-add-presence-federation

Commits on Jul 16, 2013

Added presence federation algorithm.
dsandras
committed

Commits on Jul 25, 2013

Removed one useless publ_notify.
dsandras
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Commits on Aug 1, 2013

Handle the fact that several pua generated documents could exist.
dsandras
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Handle the case where rpid:activities exist but has no children.
dsandras
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Commits on Aug 5, 2013

Use DBG messages instead of ERR when convenient.
dsandras
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Commits on Aug 7, 2013

Only release the lock when we found no presentity.
dsandras
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Commits on Aug 21, 2013

Commits on Aug 22, 2013

Fixed a few more leaks in the XML code.
dsandras
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Commits on Oct 31, 2013

Removed SNOM hack. Their 8.7.3.25 firmware fixes this bug.
dsandras
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