Merged revisions 237405 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

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  r237405 | tilghman | 2010-01-04 12:19:00 -0600 (Mon, 04 Jan 2010) | 16 lines
  
  Add a flag to disable the Background behavior, for AGI users.
  This is in a section of code that relates to two other issues, namely
  issue #14011 and issue #14940), one of which was the behavior of
  Background when called with a context argument that matched the current
  context.  This fix broke FreePBX, however, in a post-Dial situation.
  Needless to say, this is an extremely difficult collision of several
  different issues.  While the use of an exception flag is ugly, fixing all
  of the issues linked is rather difficult (although if someone would like
  to propose a better solution, we're happy to entertain that suggestion).
  (closes issue #16434)
   Reported by: rickead2000
   Patches: 
         20091217__issue16434.diff.txt uploaded by tilghman (license 14)
         20091222__issue16434__1.6.1.diff.txt uploaded by tilghman (license 14)
   Tested by: rickead2000
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@237406 65c4cc65-6c06-0410-ace0-fbb531ad65f3