Completed changes to D4UnMarshallerTest.cc
Completed changes to D4UnMarshallerTest.cc

This copy of the tests hould work on both little- and big-endian
hosts.

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