Switch to using readline() for getting terminal input. I can't seem

to get the history capabilities working yet, but even so, it does
better handling of the prompt and strips newlines for us, so it's
still a win.

Add a few new commands for terminal mode: help, sig, part, erase.
Display rudimentory help using the help command.

Add some function prototypes.


git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk@36 81a1dc3b-b13d-400b-aceb-764788c761c2

avrdude/Makefile

@@ -22,7 +22,7 @@ INSTALL_MANUAL  = ${INSTALL_DATA}
 all : $(TARGET)
 
 $(TARGET) : avrprog.c
-	$(CC) $(CFLAGS) -o $(TARGET) $<
+	$(CC) $(CFLAGS) -o $(TARGET) $< -lreadline
 
 clean :
 	rm -f *~ *.core $(TARGET)