Fixed concatenation of _proj and _sel members into request_das and request_dds URLs.
Fixed concatenation of _proj and _sel members into request_das and
request_dds URLs.


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