Working Define CF Model dialog and NXspectrum fix

• The NeXpy "Define CF Model" plugin dialog is now functional, with a parameter grid for the rare earth, symmetry, Stevens parameters, Hz/Hx, and temperature, plus Load/Plot/Save actions and "Overplot Spectrum"/"Plot as Line" plot options.
• from cfcal import CF now works — CF is exposed at the package top level.
• Fixed a TypeError raised by CF.NXspectrum() when no eps energy grid was given; the default grid was never being computed.

Use setuptools_scm for version control

• Packaging now uses setuptools_scm via pyproject.toml in place of versioneer.

Renamed tag for PyPI

• Need a new filename.

Fix versioneer installation

• PyPI installations were failing to find the versioneer module.

Package renamed to CFcal

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

Add support for versioneer

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

Support for more CF lineshapes

• 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).

Initial Release

This is an initial release of the CFlib package.