[sugar] AUTHORS and COPYING

[Jani Monoses]

Hello,

not all sugar and related projects include up-to date data on authors 
and licensing. The former can be inferred from git logs but the latter
requires going through all source files.

In particular sugar-artwork includes a copy of the GPL, but the sources 
contain an LGPL and a BSD style licensed file as well.

I think the MaMaMedia projects also lacked licensing info last I looked.

Can each module author please make sure their own projects are correctly
carrying a complete copyright notice and if possible an AUTHORS file?

For getting packages in distributions the legal implications should be 
clear and lack of copyright notices in upstream sources is blocking 
uploads to public archives.

thank you
Jani