Implemented ecl_refcase_list to hold a collection of refcase for e.g. plotting
Made the ecl_refcase_list glob pattern more stable
Path not required in pair
Added REFCASE_LIST_KEY + refcase_list will drop non existing cases on demand
Added more ecl_config / ecl_refcase_list testing
Renamed ecl_refcase_list_iget_fullpath
Created function config_schema_item_set_default_type()
Added ecl_refcase_list_has_case() and _get_case()
Added function ecl_sum_time2days()
Added time_map_get_(start|end)_time()
Added type_vector_rnage
Implemented ecl-refcase_list in plotting
Minor ecl_refcase_list fix