main/astobj2: Make REF_DEBUG a menuselect item; improve REF_DEBUG output

This patch does the following:
(1) It makes REF_DEBUG a meneselect item. Enabling REF_DEBUG now enables
    REF_DEBUG globally throughout Asterisk.
(2) The ref debug log file is now created in the AST_LOG_DIR directory.
    Every run will now blow away the previous run (as large ref files
    sometimes caused issues). We now also no longer open/close the file
    on each write, instead relying on fflush to make sure data gets written
    to the file (in case the ao2 call being performed is about to cause a
    crash)
(3) It goes with a comma delineated format for the ref debug file. This
    makes parsing much easier. This also now includes the thread ID of the
    thread that caused ref change.
(4) A new python script instead for refcounting has been added in the
    contrib/scripts folder.
(5) The old refcounter implementation in utils/ has been removed.

Review: https://reviewboard.asterisk.org/r/3377/
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Merged revisions 412114 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 412115 from http://svn.asterisk.org/svn/asterisk/branches/11
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Merged revisions 412153 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@412154 65c4cc65-6c06-0410-ace0-fbb531ad65f3

build_tools/cflags.xml

@@ -5,6 +5,9 @@
 		<member name="DEBUG_THREADS" displayname="Enable Thread Debugging">
 			<support_level>core</support_level>
 		</member>
+		<member name="REF_DEBUG" displayname="Enable reference count debugging">
+			<support_level>extended</support_level>
+		</member>
 		<member name="STATIC_BUILD" displayname="Build static binaries">
 			<support_level>extended</support_level>
 		</member>