v0.5.0

ProteinChains v0.5.0

Diff since v0.4.0

• Add ProteinChain ins_codes field.
• Add ProteinStructure properties field.
• More robust and consistent ProteinStructureStore IO.
• Remove renumbering functions
• Remove BackboneGeometry and IdealResidue types and prepend/append residue functions.
• Make ProteinChain and ProteinStructure types mutable.
• Add addproperties!, removeproperties!, and setproperties! functions.