Adding a new dialplan function AUDIOHOOK_INHERIT

This function is being added as a method to allow for
an audiohook to move to a new channel during a channel
masquerade. The most obvious use for such a facility is
for MixMonitor when a transfer is performed. Prior to
the addition of this functionality, if a channel 
running MixMonitor was transferred by another party, then
the recording would stop once the transfer had completed.
By using AUDIOHOOK_INHERIT, you can make MixMonitor 
continue recording the call even after the transfer
has completed.

It has also been determined that since this is seen
by most as a bug fix and is not an invasive change,
this functionality will also be backported to 1.4 and
merged into the 1.6.0 branches, even though they are
feature-frozen.

(closes issue #13538)
Reported by: mbit
Patches:
      13538.patch uploaded by putnopvut (license 60)
	  Tested by: putnopvut

Review: http://reviewboard.digium.com/r/102/



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@166092 65c4cc65-6c06-0410-ace0-fbb531ad65f3

CHANGES

@@ -71,6 +71,8 @@ Dialplan Functions
  * Added LOCAL_PEEK, which I have no idea how to use, but Leif Madsen wanted it.
    Russell says it's, like, a scope resolution function for LOCAL variables.
    Totally.  Hopefully, that means more to you than it does to me.
+ * Added AUDIOHOOK_INHERIT. For information on its use, please see the output
+   of "core show function AUDIOHOOK_INHERIT" from the CLI
 
 Applications
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