05-14-90 - JR - ADCP.H:
                rearranged ANCILLARY_1 and CONFIGURATION_1 structures
                to accommodate Sun4 architecture
06-12-90 - JR - ADCP.H:
                added USER_BUFFER_TYPE, GPS_STATUS_TYPE & TRANSIT_FIX_TYPE
06-22-90 - JR - ADCP.H:
                moved USER_BUFFER_*_TYPE, etc. to new file:
              - USERBUFF.H:
-------------------------------------------------------------------------------
07-10-90 - JR - adcp.h:
                dropped unused anc24 member of ANCILLARY_2_TYPE so the
                structure size will be a multiple of 4 as required by the
                SPARC.
01-15-90 - JR - adcp.h:
                dropped loran_ part of navigation structure element names