Stellarium 0.12.4 legacy

[Tomasz Buchert <tomasz.buchert@inria.fr>]

Hi guys,
one of the stellarium developers asked me if we could create
a legacy version of stellarium 0.12.4 (the current version
that is likely to be in jessie is 0.13.0 [1]). The reasons he mentions:

   * 0.13.0 requires OpenGL 2.1+ and shaders - this maybe
     problematic for machines older than 5-6 years or some Intel GPUs;
     this version runs on Qt5 as well
   
   * on the other side, 0.12.4 requires only OpenGL 1.4 without shaders;
     this version runs on Qt4

The idea is to create a "legacy" package named "stellarium-legacy"
or "stellarium-qt4". The second name is probably prefered, because FreeBSD
has such a package [2] already.

I'm looking for a healthy discussion if we want such a package in jessie,
and if yes, a sponsor to upload it to the archive (I will take care of general
maintenance).

Cheers,
Tomasz

[1] https://packages.qa.debian.org/s/stellarium.html
[2] http://portsmon.freebsd.org/portoverview.py?category=astro&portname=stellarium-qt4