Reduces warnings while running tests.
Also fix some descriptions with strings concatenated but without a
space in between.
Reviewed by campbellbarton
Differential Revision: https://developer.blender.org/D9655
Comments
========
This is 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’.