Locate and position the current Audacity source code, and clear a variety of old junk out of the way into junk-branches

dox2-src/MainPage.dox2

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+/**********************************************************************
+
+  Audacity: A Digital Audio Editor
+
+  MainPage.dox2
+
+  James Crook
+
+********************************************************************//**
+
+\mainpage Audacity Index Page
+
+\section intro_sec Introduction
+
+Audacity is a free, easy-to-use audio editor and recorder for Windows, 
+Mac OS X, GNU/Linux, and other operating systems.
+
+\section license License
+
+Audacity is free software, developed by a group of volunteers and 
+distributed under the GNU General Public License (GPL).  See
+License.txt for details.
+
+Free software is not just free of cost (like "free beer"). 
+It is free as in freedom (like "free speech"). Free software gives you 
+the freedom to use a program, study how it works, improve it, and share 
+it with others. For more information, visit the Free Software Foundation.
+
+Programs like Audacity are also called open source software, because their 
+source code is available for anyone to study or use. There are thousands of 
+other free and open source programs, including the Mozilla web browser, the 
+OpenOffice.org office suite, and entire Linux-based operating systems.
+
+\section src_code Understanding The Source Code
+
+To understand the GUI parts of Audacity, you will first need to familiarise 
+yourself with the wxWidgets toolkit. You will find \ref ShuttleSystem used very
+widely for user interface construction. See the classes in src/widgets
+for how we create new widgets of our own.
+
+ - A great deal of the Audio processing in Audacity is done using libraries of
+code such as libsndfile and allegro.  Some self contained audio functions
+can be found in src/effects, for example EffectEcho and its accompanying
+dialog EchoDialog.
+ - The BlockFile system is central to how Audacity allows cut and paste
+of audio to be performed efficiently.  It works closely with the DirManager
+class.
+
+Also look at the overview pages in the Doxygen documentation, which cover 
+special topics.
+
+*//**************************************************************************/
+
+
+
+