v0.4.1

AtomsBase v0.4.1

Diff since v0.4.0

A few minor bugfixes.

Merged pull requests:

• Several Minor Bugfixes (#114) (@cortner)

Closed issues:

• Interfacing extended XYZ readers and writers for AtomsBase (#40)
• Chemical Element (#49)
• Boundary Conditions (#97)
• Introduce Cell types (#99)
• Introduce mass (#100)
• AbstractSystem not exported any more in v0.4 (#109)
• atomic_number(::Int16) is undefined (#112)
• Some ChemicalSpecies constructors create nneut=0 (#113)