sbc b/f: handle rejected offer
core: new callback when UAC/UAS transaction is finished
sbc: added support for re-trying failed re-INVITEs

... for few scenarios only for now (local hold/unhold request, local reINVITE)
sbc: make timer for re-trying upon 491 reply configurable
core: b/f: do not re-use the uac transaction iterator after onRxReplyStatus()

The transaction could possibly have been deleted in between, whereby it is unclear where.
core: fixed onRxReplyStatus method call
doc:update build instruction to new debian pkg dir
sbc b/f: allow to disable session timers in A leg

thanks Herve Couplet for reporting and providing the fix
b2b media b/f: fix crash if 200OK arrived after rtp timeout event

thanks Michael Furmur for debugging, reporting and providing the fix
Merge branch kubartv/error_recovery

Conflicts:
	core/AmBasicSipDialog.cpp
pkg/deb/debian: Upgrade debian packaging.
pkg/deb: add jessie, wheezy and precise distributions