adding operator dictionaries
changing CCbond to 1.42 angstroms
adding new module of conversion factors
adding conversion factor module imports
adding property and compute method for linear mass density of swcnts
removing reference for C-C bond value since it changed
adding new method to compute unit cell mass
updating docstring
adding new method to filter list of Ch data
adding new atom_style property attribute
adding more fullerene data to spreadsheet
adding new helper function module to nanogen package
adding _nanogen_funcs import to __init__ module
adding exception handling for ZeroDivisionError
implement code for generate_Ch_property_grid function
updating docstrings
updating docstrings and setting np.seterr(all='raise')
tweaking code for efficiency and adding docstring
change default values of p and q in compute_R method
adding docstring directives for helper functions