Changelog

Fixes

• structure.io.gro.GROFile appends a newline at the end of file
  • This allows PyMOL to open .gro files
• structure.io.pdb.PDBFile raises an exception when coordinates contain NaN values
• structure.io.pdb.PDBFile works properly for residue IDs greater than 9999
• structure.io.pdb.PDBFile works properly for atom array lengths greater than 199998