In python/ctsm/crop_calendars/, process_ggcmi_shdates.py and regrid_ggcmi_shdates.py are used to convert the raw GGCMI crop calendar files into CTSM-compatible versions. This update fixes some bugs, removes dependencies on the nco utilities, enables the use of surface datasets as template files (in addition to the existing ability to use CTSM output files), and standardizes things for consistency with other CTSM Python tools.