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Solution for T63207 needed before add-on will run on 2.80.

Comments
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The two (old) XYZ addons were deleted because of the fusion of the 3 atomic blender addons from Blender 2.79:

    1. PDB (I/O addon for .pdb files, was in trunk before)
    2. XYZ (I/O addon for .xyz files, was in contrib before)
    3. Utilities (panel for modifying atomic structures, was in contrib before),

into one single addon called ‘Atomic Blender PDB/XYZ’.

2. Add: some properties of the ligth source are set for cycles (xyz importer)
3. Add: some material properties are set for cycles (panel utilities)

The shapes of selected objects or objects of duplivert meshes can now be
replaced, e.g., NURBS spheres by icospheres ... . For Blender 2.80, one
has to consider the role of collections in the code, which is what I have
done.

Amazing, that I haven't found this spelling mistake before, and I deal with
nanoparticles made from platinum in my research, already for many years!

Fix: (a) assign a default material if element name is not correctly written, (b) 'Platinium' to 'Platinum'

A collection is now used, which contains the dupliverts structure composed of
the representative ball (atom) and the corresponding mesh (atom positions).
The collection carries the name 'cluster' + the type of lattice and shape +
the element name.

Reason: (a) there has been no important feedback for this addon the last 5 years,
(b) nobody is maintaining the addon, (c) I simply have no time for maintainance.
If somebody needs this addon in future due to any reasons, I'm willing to help.

Reason: such functionalities (e.g., increasing/decreasing size of atom balls) can be
already found in the 'Atomic Blender Utilities' addon.

This concerns
- Register / unregister classes
- Matrix/vector multiplication
- Removal of the old 'layer' concept

The addon runs perfectly well! What I will do next is to make use of the
collection principle.

The size of the sticks could not be changed because the representative 2 objects
(cylinder and cup) were not visible => 'EDIT' view mode does not work in this case.

There was a problem with separating atoms from a dupliverts structure: the
separated atom did not appear and the mesh was wrongly deleted. All this
is fixed now. Basically, it was a matter of putting the atom into the
collection.

Change of concept: representative objects (atoms as balls) of a duplivert structure are hidden in the view_port

I'm very happy about the new concepts of Blender 2.80! This is yet another example.
These representative objects of a duplivert structure can now be invisible. Their
presence in a, e.g., 3D view has no meaning. They are anyway reproduced at the mesh
and are visible at the vertices of the mesh. Cool thing!

The problem was that the color in Blender 2.79 was described by a 3 tuple. In Blender
2.80 it is a 4 tuple.