Remove Copyright from every source file

Replace it by website link; copyright appears in the LICENSE file already, which is sufficient
diff --git a/examples/cdecl.py b/examples/cdecl.py
index 58721d1..39ac5e8 100644
--- a/examples/cdecl.py
+++ b/examples/cdecl.py
@@ -16,7 +16,7 @@
 # =>
 # ar is a pointer to array[10] of pointer to const Node
 #
-# Copyright (C) 2008-2015, Eli Bendersky
+# Eli Bendersky [http://eli.thegreenplace.net]
 # License: BSD
 #-----------------------------------------------------------------
 import sys