Added GLK12232-25SM support with glk driver.

Fixed lots of small problems in various places.
Added new protocol commands screen_add/del_key so screens
   can request keystrokes when they are being displayed.
Lots of work on CPU GRAPH and BIG NUMBER CLOCK screens.
Fixed 'output' function in MtxOrb.c

acinclude.m4

@@ -6,10 +6,10 @@ AC_ARG_ENABLE(drivers,
 	[                  drivers may be separated with commas.]
 	[                  \"all\" compiles all drivers],
   	drivers="$enableval", 
-  	drivers=[mtxorb,cfontz,curses,text,lb216,bayrad])
+  	drivers=[mtxorb,cfontz,curses,text,lb216,bayrad,glk])
 
 if test "$drivers" = "all"; then
-	drivers=[mtxorb,cfontz,curses,text,lb216,hd44780,joy,irman,lircin,bayrad]
+	drivers=[mtxorb,cfontz,curses,text,lb216,hd44780,joy,irman,lircin,bayrad,glk]
   	AC_MSG_RESULT(all)
 fi
 
@@ -22,6 +22,10 @@ fi
 			DRIVERS="$DRIVERS MtxOrb.o"
 			AC_DEFINE(MTXORB_DRV)
 			;;
+		glk)
+			DRIVERS="$DRIVERS glk.o glkproto.o"
+			AC_DEFINE(GLK_DRV)
+			;;
 		bayrad)
 			DRIVERS="$DRIVERS bayrad.o"
 			AC_DEFINE(BAYRAD_DRV)