Fixed invalid memory and broken invariant problem with using deleted copy in Grid::add_var().  Ticket #1530 revealed this.
Fixed invalid memory and broken invariant problem with using deleted copy in Grid::add_var().  Ticket #1530 revealed this.

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