New version: Crystalline v0.6.0

[JuliaRegistrator]

• Registering package: Crystalline
• Repository: https://github.com/thchr/Crystalline.jl
• Created by: @thchr
• Version: v0.6.0
• Commit: 6357eea0536afe5cb6355baf61c722a79b23dc1d
• Reviewed by: @thchr
• Reference: thchr/Crystalline.jl@6357eea#commitcomment-146760256
• Description: Tools for crystallographic symmetry analysis
• Release notes:

This is intended as a preliminary release of a v0.6 series, with some flux still to be expected in the definitions of `BandRep`, `NewBandRep`, and `SymmetryVector` as well as tooling around it.

## New features
- `nigglibasis`: compute the Niggli-reduced cell basis.
- `SymmetryVector`: encode the symmetry content of a set of irrep multiplicities
- Use `SymmetryVector` to define a new type `NewBandRep{D}` (and `Collection{NewBandRep{D}}`, which is expected to replace `BandRep` (and `BandRepSet`) eventually.

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