Added `group` for prior vs posterior
added a "group" argument to all get and set functions so you can specify whether you want to put things inthe prior or the posterior group. Could also be used as a way to add multiple results into one file.
added a "group" argument to all get and set functions so you can specify whether you want to put things inthe prior or the posterior group. Could also be used as a way to add multiple results into one file.