Reformat copyright banner.

Add @file doxygen comment to each file.
Partially Issue 40.

src/examples/nfcip-target.c

@@ -1,3 +1,26 @@
+/**
+ * Public platform independent Near Field Communication (NFC) library
+ * 
+ * Copyright (C) 2009, Roel Verdult
+ * 
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ * 
+ * This program 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 Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ * 
+ * 
+ * @file nfcip-target.c
+ * @brief
+ */
+
 #include <stdio.h>
 #include "libnfc.h"