highlight: add copyright and license header

hgext/highlight/__init__.py

@@ -1,3 +1,13 b''
+# highlight - syntax highlighting in hgweb, based on Pygments
+#
+#  Copyright 2008, 2009 Patrick Mezard <[e-mail]> and others
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2, incorporated herein by reference.
+#
+# The original module was split in an interface and an implementation
+# file to defer pygments loading and speedup extension setup.
+
 """syntax highlighting in hgweb, based on Pygments
 
 It depends on the pygments syntax highlighting library:

hgext/highlight/highlight.py

@@ -1,4 +1,9 b''
-# highlight extension implementation file
+# highlight.py - highlight extension implementation file
+#
+#  Copyright 2007-2009 Adam Hupp <[e-mail]> and others
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2, incorporated herein by reference.
 #
 # The original module was split in an interface and an implementation
 # file to defer pygments loading and speedup extension setup.