libnm-util, libnm-glib: standardize copyright/license headers

- Remove list of authors from files that had them; these serve no
  purpose except to quickly get out of date (and were only used in
  libnm-util and not libnm-glib anyway).

- Just say "Copyright", not "(C) Copyright" or "Copyright (C)"

- Put copyright statement after the license, not before

- Remove "NetworkManager - Network link manager" from the few files
  that contained it, and "libnm_glib -- Access network status &
  information from glib applications" from the many files that
  contained it.

- Remove vim modeline from nm-device-olpc-mesh.[ch], add emacs modeline
  to files that were missing it.

libnm-glib/nm-object-cache.c

@@ -1,7 +1,5 @@
 /* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
 /*
- * libnm_glib -- Access network status & information from glib applications
- *
  * This library 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
@@ -17,7 +15,7 @@
  * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301 USA.
  *
- * Copyright (C) 2008 Red Hat, Inc.
+ * Copyright 2008 Red Hat, Inc.
  */
 
 #include <string.h>