Added LGPL copyright headers to all files that did undergo significant changes during the development of BaS_gcc.

Didn't touch any files that weren't changed.
Added COPYING and COPYING.LESSER, the LGPL mandatory license files

sources/sysinit.c

@@ -18,6 +18,11 @@
  *
  * You should have received a copy of the GNU General Public License
  * along with BaS_gcc.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright 2010 - 2012 F. Aschwanden
+ * Copyright 2011 - 2012 V. Riviere
+ * Copyright 2012        M. Froeschle
+ *
  */
 
 #include "MCF5475.h"