Doxygen documentation for text.h, SFont.h, setup.h, realpath.h, readline.h, palette.h, keyboard.h, io.h, input.h, hotkeys.h, helpfile.h, errors.h; and a basic description for all other headers.

Removed 2 unused function prototypes (They escaped translation)
In each C file, added a #include of its own header, to help doxygen generate a more complete documentation for the C files (and also double-check function prototypes)

All these changes don't change the generated executable, it's still beta 99.0.

git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@752 416bcca6-2ee7-4201-b75f-2eb2f807beb1

graph.h

@@ -19,6 +19,11 @@
     59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
 
+//////////////////////////////////////////////////////////////////////////////
+///@file graph.h
+/// Graphic functions that target the screen and/or image.
+//////////////////////////////////////////////////////////////////////////////
+
 void Shade_list_to_lookup_tables(word * list, short step, byte mode, byte * table_inc,
         byte * table_dec
 );