* Remove unnecessary memset
* Narrow the scope of the global lock on session initialization
* Assert for couple of expected pointers

This won't fix anything, it's just maintenance clean up done
while investigating FS-8312.

FS-7800 should be able to call extra screens with same extension as the original and place the param conferenceCanvasID with the desired canvas id into the call params in the same place bandwidth prefs are added

FS-8957 #resolve [Video image sometimes blips on personal canvas mode when 1 participant is watching voh]

* commit 'd1680d7b':
  FS-7915 parse and store multiple path fields

Merge pull request #740 in FS/freeswitch from ~DCOLOMBO/freeswitch:bugfix/OPENZAP-241-ftmod_libpri-doesn-t-close-channel to master

* commit '5e5bc23f':
  OPENZAP-241: set always STATE_HANGUP_COMPLETE

Merge pull request #751 in FS/freeswitch from ~DCOLOMBO/freeswitch:bugfix/FS-8945-dont-show-preview-setting-during to master

* commit '871785d6':
  FS-8945 - [verto_communicator]  don't show preview settings during video call

* commit '3d90d752':
  FS-8406 #resolve #comment improvement to drop video packets on slow rtmp link
  FS-8406 #comment add options to scale down cavas size, fps and bandwidth

* commit '8423f28d':
  FS-8841 #resolve [Debian - FS Hang ]

FS-8168: use copy image functions from libyuv instead of our home rolled versions as the libyuv versions have optimizations

Merge pull request #714 in FS/freeswitch from ~PIOTRGREGOR/freeswitch:bugfix/FS-8855-avmd-bug-in-calculation-of-tone-s to master

* commit 'f561f1cd':
  FS-8855 fix calc of variance of tone's freq estimator

FS-8928: flag a bidning error when using EventConsumer::bind with invalid event name instead of blindly using custom

* commit '3b4b839e':
  FS-8948 #resolve Handle non-existent config in Debian postinst

When the "freeswitch" package was installed directly on Debian, i.e.
without one of the meta packages pulling in the vanilla configuration
(freeswitch-conf-vanilla), the "postinst" script failed:

  $ apt-get install freeswitch
  …
  Setting up freeswitch (1.6.6~13~d2d0b328-1~jessie+1) ...
  cp: cannot stat ‘/usr/share/freeswitch/conf/vanilla/*’: No such file
  or directory
  …

With this change the code tests for "freeswitch.xml" before attempting
to copy the configuration files.

Merge pull request #756 in FS/freeswitch from bugfix/FS-8953-whitespace-cleanup-src-switch_-.c to master

* commit 'e18c12b6':
  FS-8953 [core] white space clean up.

Change SMA buffer APPEND_SMA_VAL macro so now the variance
of tone's frequency estimation is correctly calculated.
Change frequency advertised in log on beep detection from
most recently computed value to average of all values used
in DESA computation.

Merge pull request #753 in FS/freeswitch from ~ZSOMKOVACS/freeswitch:feature/FS-8870-log-call-quality-statistics to master

* commit '73c30999':
  FS-8870: add human-readable call quality statistics logs on call hangup

FS-8946: [mod_xml_cdr] fix segfault on call after loading with no config file or event bind failure causing module load failure

Merge pull request #750 in FS/freeswitch from ~ASIP42/freeswitch:bugfix/FS-8943-misspelling-in-two-comments to master

* commit 'ca39418f':
  FS-8943 Fixed misspellings in two comments

Merge pull request #742 in FS/freeswitch from ~PIOTRGREGOR/freeswitch:bugfix/FS-8853-enable-change-of-resolution-and-size-2 to master

* commit 'da7be641':
  FS-8853 enable change of resolution of fast arc cos table

Merge pull request #712 in FS/freeswitch from ~PIOTRGREGOR/freeswitch:bugfix/FS-8810-avmd-cosinus-table-creation-fails to master

* commit '1c39305f':
  FS-8810 fix crash on FS startup

Merge pull request #180 in FS/freeswitch from ~CXREG/freeswitch-memcache-file:file_interface_for_mod_memcache to master

* commit 'a2cecbcc':
  FS-7286 add file_interface support to mod_memcache