added copyright.h for review

copyright.h

+
+Here is the proposed copyright message to be added to all source files
+at their top.  There is one line that represents the main copyright holder
+and that would be Jean-Pierre Charras for existing modules.  
+
+But in the future, the respective author of any newly coded module would be
+listed as the main copyright holder. Additional workers who might earn a
+partial copyright holder status of the respective module are simply left in the
+change_log.txt file, see the 2nd Copyright line below.
+
+Jean-Pierre, let me know if this is satisfactory and I will run a script I have to 
+pre-pend it to all the sources.   
+
+Thanks, Dick Hollenbeck dick@softplc.com.
+
+
+
+/*
+ * This program source code file is part of KICAD, a free EDA CAD application.
+ *
+ * Copyright (C) 2004-2007 Jean-Pierre Charras, jean-pierre.charras@inpg.fr
+ * Copyright (C) 2004-2007 Kicad Developers, see change_log.txt for contributors.
+ * 
+ * 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
+ * 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 General Public License
+ * along with this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html 
+ * or you may search the http://www.gnu.org website for the version 2 license, 
+ * or you may write to the Free Software Foundation, Inc., 
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */