Repaired d4_function/D4FunctionEvaluator.cc (See HYRAX-247)
Repaired d4_function/D4FunctionEvaluator.cc (See HYRAX-247)

I used std::set which is supposed to preserve order, but apparently
does not with gcc 4.8 and some levels of optimization.

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