Added 3 african sky culture

[alex-w]

Description

Added 3 African sky cultures:

• Zulu
• Xhosa
• Khoikhoi and San

Add sky cultures was created by Suki Lock for the South African Astronomical Observatory, based on information compiled by Auke Slotegraaf.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• This change requires a documentation update

How Has This Been Tested?

Test Configuration:

• Operating system: Ubuntu Linux 18.04
• Graphics Card: * nVidia GeForce GTX 550 Ti/nvidia 390.87

Checklist:

• My code follows the code style of this project.
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[gzotti]

Welcome additions, in principle. However, the descriptions leave much to deserve. The skycultures may be targeted to South Africans, but we should think globally. Many (if not most) people outside Africa know that these people "live in Africa". But where? Explanations start here! General introduction about the respective groups, maybe a map (Africa with colored area should be OK) and no clear references given. Did Auke Slotegraaf write a book, is/was he ethnologer, astronomer, missionary, surveyor, railway builder, hunter, adventurer? In which decade? Any quotable information or contact addresses possible?

star_names.fab: Names in English? Why not the own names? (all 3 cultures)

Xhosa: isiLimela (Pleiades) "First Sighting" in morning or evening skies?

Khoikhoi&San: The constellation artwork with painted stars in no way matches real stars.

We are about to introduce classification labels. This should be labelled "incomplete" IMHO, but is barely acceptable.

[bobmeisterr]

Is there any chance I could have a look at these 3 skycultures? I'd really appreciate it if I could! Thanks :).

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