kamailio.cfg: coherent formating

- compacted some sub-routes by reducing if-block identation with returns
kamailio: note that NAT OPTIONS keepalive can be enabled with define WITH_NATSIPPING
kamailio-basic.cfg: updates to track minimal common parts with kamailio.cfg
kamailio-oob.cfg: sync'ed basic common parts with kamailio.cfg
permissions: Fix typo in documentation
core: add received parameter to via if rport parameter is present

- required by RFC3581, section 4.
tm: test ending angle bracket for From/To URI when genrating local requests

- the value can start with a display name and can end up with double
  angle bracketting
xmlrpc Update docs, change SER to &kamailio;, fix typo
jsonrpc-s Update docs

JSON-RPC is called JSON-RPC with a hyphen.
uuid Minor doc updates
dispatcher: added ids to some sections in docs
dialog: set again the dialog ids in context for BYE processing

- they can be reset by event route execution
usrloc: restore usrloc attributes in DB_ONLY mode

- restores xavps per location during a lookup
exec: safety check against bash vulnerability CVE-2014-6271
exec: add parameter to control the option for bash exec safety check of CVE-2014-6271

- parameter: bash_safety - default is 1 (enabled), set to 0 to disable
- just in case someone needs that kind of header and knows what
  he/she does
permissions: Update docs

- Add overview
- Add section ID's
- Add missing WS and WSS transports
permissions: Update docs about "mask" field. We do support IPv6.
sanity Update docs, add standard section IDs
statistics: minor update of docs
tls: documentation updates