doxygen: rename included files (they were ignored)

doc/doxygen/doxygen.main.h

@@ -0,0 +1,19 @@
+/** \mainpage Blender
+ *
+ * \section intro Introduction
+ *
+ * Blender is an integrated 3d package.
+ *
+ * These pages document the source code of blender.
+ *
+ * \subsection implinks Important Links
+ * - <a href="http://developer.blender.org">developer.blender.org</a> with bug tracker
+ * - <a href="http://wiki.blender.org/index.php/Dev:Contents">Development documents</a> on our wiki.
+ *
+ * \subsection blother Other
+ * For more information on using Blender browse to http://www.blender.org
+ *
+ */
+
+/** \defgroup undoc Undocumented
+ *  \brief Modules and libraries that are still undocumented, or lacking proper integration into the doxygen system, are marked in this group. */