Cleanup: conform headers to have license first

Also remove doxy comments for licenses and add missing GPL header.

source/blender/compositor/nodes/COM_BlurNode.h

@@ -1,6 +1,4 @@
 /*
- * Copyright 2011, Blender Foundation.
- *
  * This program 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 2
@@ -14,6 +12,8 @@
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Copyright 2011, Blender Foundation.
  */
 
 #ifndef __COM_BLURNODE_H__