changed file headers to reflect the totally refactored state of the serial and print modules

print.c

@@ -1,3 +1,27 @@
+/*
+  print.c - Functions for formatting output strings
+  Part of Grbl
+
+  Copyright (c) 2009-2011 Simen Svale Skogsrud
+
+  Grbl is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  Grbl is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with Grbl.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/* This code was initially inspired by the wiring_serial module by David A. Mellis which
+   used to be a part of the Arduino project. */ 
+
+
 #include <math.h>
 #include <avr/pgmspace.h>
 #include "serial.h"