The Grid map_rbegin and rend methods were not using d_is_array_set correctly. Fixed.
The Grid map_rbegin and rend methods were not using d_is_array_set correctly. Fixed.

OPENDAP/libdap4,OPENDAP/libdap4,OPENDAP/libdap4,OPENDAP/libdap4,OPENDAP/libdap4,OPENDAP/libdap4