npgamma 0.8.2

`npgamma` is deprecated. Please use `gamma` module within the `pymedphys` package instead.

npgamma is deprecated. A known bug in this version of npgamma is that the evaluation and reference grid definitions are flipped. This has flow on effects to parameters such as the lower_dose_threshold and simply swapping evaluation and reference grids may not achieve the desired results.

npgamma is superceded by pymedphys.gamma.

To install pymedphys see https://pymedphys.com/en/latest/getting-started/installation.html

On usage of the gamma function within pymedphys see https://pymedphys.com/en/latest/user/gamma.html