update docstring
remove print output
updating docstrings and minor code updates
bump pkshared version dependency
change Natoms property to return atoms.Natoms attribute
implement DATA2XYZConverter class
handle errors better and other small updates
increase precision of atom coordinates written to file
adding chemistry package
adding more method calls for pizza.py compatibility
updating docstring and adding specs for LAMMPS dump files
clean up code
begin adding code for lammps_dump structure data reader
fix install_requirements and update docstring