* Move LaTeX docs into a tex/ subdirectory of the doc/ dir

* Add a Makefile in doc/tex/ for generating PDF and HTML
* Add a README.txt file to doc/tex/ to document which tools are used and what
  web sites to visit for getting them.
* Update build_tools/prep_tarball to put the proper Asterisk version string
  in the automatically generated PDF for release tarballs


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@72982 65c4cc65-6c06-0410-ace0-fbb531ad65f3

doc/tex/dundi.tex

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+http://www.dundi.com
+Mark Spencer, Digium, Inc.
+
+DUNDi is essentially a trusted, peer-to-peer system for being able to
+call any phone number from the Internet.  DUNDi works by creating a
+network of nodes called the "DUNDi E.164 Trust Group" which are bound by
+a common peering agreement known as the General Peering Agreement or
+GPA.  The GPA legally binds the members of the Trust Group to provide
+good-faith accurate information to the other nodes on the network, and
+provides standards by which the community can insure the integrity of
+the information on the nodes themselves.  Unlike ENUM or similar
+systems, DUNDi is explicitly designed to preclude any necessity for a
+single centralized system which could be a source of fees, regulation,
+etc.
+
+Much less dramatically, DUNDi can also be used within a private
+enterprise to share a dialplan efficiently between multiple nodes,
+without incurring a risk of a single point of failure.  In this way,
+administrators can locally add extensions which become immediately
+available to the other nodes in the system.
+
+For more information visit http://www.dundi.com
+
+\section{DUNDIQUERY and DUNDIRESULT}
+
+The DUNDIQUERY and DUNDIRESULT dialplan functions will let you initiate
+a DUNDi query from the dialplan, see how many results there are, and access
+each one.  Here is some example usage:
+
+\begin{verbatim}
+exten => 1,1,Set(ID=${DUNDIQUERY(1|dundi_test|b)})
+exten => 1,n,Set(NUM=${DUNDIRESULT(${ID}|getnum)})
+exten => 1,n,NoOp(There are ${NUM} results)
+exten => 1,n,Set(X=1) 
+exten => 1,n,While($[${X} <= ${NUM}])
+exten => 1,n,NoOp(Result ${X} is ${DUNDIRESULT(${ID}|${X})}) 
+exten => 1,n,Set(X=$[${X} + 1])
+exten => 1,n,EndWhile
+\end{verbatim}
+