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

op_c.h

@@ -18,6 +18,14 @@
     write to the Free Software Foundation, Inc.,
     59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
+
+//////////////////////////////////////////////////////////////////////////////
+///@file op_c.h
+/// Color reduction and color conversion (24b->8b, RGB<->HSL).
+/// This is called op_c because half of the process was originally 
+/// coded in op_asm, in assembler.
+//////////////////////////////////////////////////////////////////////////////
+
 #ifndef _OP_C_H_
 #define _OP_C_H_