Cfcal

* Need a new filename.

* PyPI installations were failing to find the `versioneer` module.

* To avoid a name clash on the PyPI server, the package has been renamed 'CFcal'

* The version number, cflib.__version__, specifies the release tag and, if applicable, the commit hash of the Github repository used in building the package.

* This version allows calls to the `spectrum` and `NXspectrum` functions to specify both `sigma` and `gamma` values. If only `sigma` (`gamma`) is given, the crystal field line shape is gaussian (lorentzian). If both values are given, a pseudo-voigt line shape is used, as defined in Ida, Ando and Toraya, J. Appl. Cryst. 33, 1311 (2000).

This is an initial release of the CFlib package.