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add notification of failed transfers (new test in call suite for that)
In case of failed transfer, referer call is resumed (if necessary) and notified of the failure.
remove deprecated code.

do not put contact_params (from proxy config) into calls, message or subscribes. They are only valid for REGISTERs.

bugfix when adding body to request: previous body, content-type and content-lenght must first be removed.

Indeed there was some risk of getting into a situation where a java LinphoneAddress would point to a destroyed C LinphoneAddress (typically with call-logs).
To prevent that, the java object can either refcount or clone the C object, depending on the constness of the C object.

This reverts commit 1edccc54.