Bug#698527: Elmer: few good news related to licensing.

[Boris Pek]

Hi folks,

There are few very good news related to licensing of libraries used by Elmer:

1) OpenCASCADE libraries were relicensed under LGPL-2.1 [1] in the last stable
   release 6.7.0, so now they are compatible with GPL-licensed libraries linked
   to ElmerGUI (for example, with libav*).

2) Next OCE (OpenCASCADE Community Edition) release (0.15) will be based on
   OpenCASCADE 6.7.0 and will be relicensed under LGPL-2.1 as well [2]. Once
   packages with OCE will be updated to version 0.15, package with ElmerGUI
   will be reintroduced in Debian and Ubuntu.

3) tetgen library was relicensed under AGPLv3 since version 1.5.0 [3] and now
   is compatible with software under GPL-3+. If I understand correctly, you may
   just update tetgen-related files in your repo and use them without license
   issues. After that tetgen-plugin will be able to be enabled in Debian and
   Ubuntu packages.

[1] http://www.opencascade.org/getocc/license/
[2] https://groups.google.com/d/msg/oce-dev/zIKPCR4qQBg/cGjswxt6YEoJ
[3] http://wias-berlin.de/software/tetgen/1.5/FAQ-license.html

If you were aware of these news, I am sorry for the noise.

Best wishes,
Boris