Retain class after pivot_parameters_*() and decum()

Correct class name for geo_upscale()

Add "upscale" method to geo_regrid()

Data structures and methods for harp_xs + functions for converting from model levels to height/pressure

At circular statistics calculations and fix some test failures

Bump version to 0.3

harp_list fixes

Add all_groups to make_verif_groups to help with setting e.g. pressure levels as a grouping var

- Add quantiles to ens_prob()

Add member_colnames() function

Fix scale_param() and make ens_prob() consistent with harpPoint

Replace join_station_groups() with join_multi_groups() generic & methods fro data frame & harp_list

Add multi_group attribute

Even better handling of multiple groups per case

join_station_groups() returns a nested tibble