Destructors are noexcept(true) in C++11

With gcc/7.3.0 one gets the following warning due to the CLOSE_FILE macro in LossDataSink:

src/Classic/Structure/LossDataSink.cpp: In destructor 'LossDataSink::~LossDataSink()':
/scratch1/scratchdirs/frey_m/libs/opal/src/src/Classic/Structure/LossDataSink.cpp:100:70: warning: throw will always call terminate() [-Wterminate]
         throw GeneralClassicException(std::string(__func__), ss.str()); \
                                                                      ^
/scratch1/scratchdirs/frey_m/libs/opal/src/src/Classic/Structure/LossDataSink.cpp:156:9: note: in expansion of macro 'CLOSE_FILE'
         CLOSE_FILE ();
         ^
/scratch1/scratchdirs/frey_m/libs/opal/src/src/Classic/Structure/LossDataSink.cpp:100:70: note: in C++11 destructors default to noexcept
         throw GeneralClassicException(std::string(__func__), ss.str()); \

As the warning explains: In C++11 destructors are noexcept(true) by default. I'll fix this by setting the destructor noexcept(false) explicitly.