3243 remove gamfun and replace it with the analytical solution from scipy#3244

timothy-nunn merged 7 commits intomainukaea/PROCESS:mainfrom

3243-remove-gamfun-and-replace-it-with-the-analytical-solution-from-scipyukaea/PROCESS:3243-remove-gamfun-and-replace-it-with-the-analytical-solution-from-scipyCopy head branch name to clipboard