- Update COPYING to the current copy of the LPGL-2.1 license from
   common-licences (only difference is some indentation).
 - Remove mixed tabs/spaces in CONTRIBUTING
 - Make INSTALL fit on 79 cols.
Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>