If we see a certain number of RTP packets from a host and port other
than was negotiated, we adjust to send our RTP to that host and port.
Traditionally we've waited for 10 packets.  This commit makes the
threshold adjustable by setting the channel variable
`rtp_auto_adjust_threshold` to any positive value less than 2^16.

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Merge pull request #5 in FS/freeswitch from ~KATHLEEN.KING/freeswitch-fork:clang-warnings-werror to master

* commit '1affff9d':
  Fixed a clang-3.5 missing-prototype warning and added doxygen documentation for switch_channel_set_presence_data_vals. #doxygen
  Fixed dead code.
  Fixed trucation of value warning.
  Removed a useless called to abs.
  Removed an autological-pointer-compare from src/switch_utils.c.
  Fixed trucation of value warning.

You can now enable the hardware dtmf detection and/or generation

This reverts commit b29a41bb.

This commit is no longer needed now that proper infrastructure has been
added to allow signaling modules to generate and detect DTMF

The feature macros should only be used for I/O module features
and not for signaling module features

freetdm: Added support for DTMF generation to be performed in the signaling modules (currently only used by the gsm signaling driver)

mod_graylog2: additional fields can now be specified by adding LOG_FIELDS[name=string_value,@#name=number_value] to beginning of log.  Added _microtimestamp additional field since graylog2 only has millisecond timestamp precision.

CID:1224272 Dereference after null check.  member can not actually be NULL in any of the scenarios calling this function

* commit '0fb179ac':
  Add new option to request TEP to be used for an outbound fax call