tm: propagate reply/failure route indexes to local uac branch

- affects the updates done in event_route[tm:local-request]
- reported by Pawel Sternal, FS#371
sl: allow send_reply() in the route block types supported by t_reply() and sl_send_reply()

- reported by Juha Heinanen, FS#362
sl: docs updated to reflect usage of send_reply()
sl: README updated
modules/registrar: Invalidate temporary GRUUs when the Call-ID changes for a sip.instance
- Fixes FS#368
modules/usrloc: Update contact field when updating a contact in the DB
- Fixes FS#368
modules/avpops: Fix 'uninitialised variable' warning
tm: exported set_t() and get_t_branch() viam tm api

- allows to backup and restore pointers to T and branch
tmx: backup and restore existing T and branch pointers for t_cancel_callid()

- reported and initial patch by Guillaume Bour
lib/kcore: make escape_param() conform to RFC3261
ndb_cassandra: Initial commit of the module

- Simply adding all the files of the new module.
rtpproxy-ng: remove trailing double \r\n from multipart SDP
modules/ims_registrar_pcscf: fix log
modules/ndb_redis: solved bug in second call to redisvCommand.
modules/ims_registrar_scscf: added missing domain unlock
	registrar_notify.c: missing domain unlock in can_subscribe_to_reg() when all checks fail
ndb_cassandra: Fixed dates and username in comments.
Merge branch 'luismartingil/ndb_cassandra'
ndb_cassandra: Changing root Makefile not to compile the module by default.

- Reusing existing db_cassandra module in the Makefile.groups
structure in order to not compile the ndb_cassandra module by default.
Merge branch 'luismartingil/ndb_cassandra'
ndb_cassandra: replaced < and > with &lt; and &gt; in docbook xml file

- it fixes readme generation errors