[Kstars-devel] Remove quaternions

[Alexey Khudyakov]

Hello!

AFAIK there were an attempt to switch to quaternions for encoding
positions on the sky. It failed and at the moment it decayed completely.
Last trace is quaternion data field in SkyPoit class.

I think this field should be removed because it only waste memory (32 bytes
per skypoint) and CPU by keeping it at sync with coordinates.

There is no point in keeping quaternion implementation either. We use
Eigen and it does provide quaternions.

Is anyone againist?