added initial version of the Doxygen manual

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@51901 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/doxygen/overviews/envvars.h

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+/////////////////////////////////////////////////////////////////////////////
+// Name:        envvars
+// Purpose:     topic overview
+// Author:      wxWidgets team
+// RCS-ID:      $Id$
+// Licence:     wxWindows license
+/////////////////////////////////////////////////////////////////////////////
+
+/*!
+ 
+ @page envvars_overview Environment variables
+ 
+ This section describes all environment variables that affect execution of
+ wxWidgets programs.
+ 
+ 
+ 
+ 
+ 
+ @c WXTRACE
+ 
+ 
+ 
+ 
+ (Debug build only.)
+ This variable can be set to a comma-separated list of trace masks used in
+ #wxLogTrace calls;
+ wxLog::AddTraceMask is called for every mask
+ in the list during wxWidgets initialization.
+ 
+ 
+ 
+ 
+ 
+ @c WXPREFIX
+ 
+ 
+ 
+ 
+ (Unix only.)
+ Overrides installation prefix. Normally, the prefix
+ is hard-coded and is the same as the value passed to @c configure via
+ the @c --prefix switch when compiling the library (typically
+ @c /usr/local or @c /usr). You can set WXPREFIX if you are for example
+ distributing a binary version of an application and you don't know in advance
+ where it will be installed.
+ 
+ 
+ 
+ 
+ 
+ @c WXMODE
+ 
+ 
+ 
+ 
+ (wxMGL only.)
+ Sets MGL video mode. The value must be in form
+ @e widthx@e height-@e depth. The default is @c 640x480-16.
+ 
+ 
+ 
+ 
+ 
+ @c WXSTDERR
+ 
+ 
+ 
+ 
+ (wxMGL only.)
+ Redirects stderr output to a file.
+ 
+ */
+ 
+