Merge pull request #736 from mantidproject/DateAndTime_long

Add automatic conversion to long integer

Code/Mantid/Framework/PythonInterface/mantid/kernel/src/Exports/DateAndTime.cpp

@@ -29,6 +29,7 @@ void export_DateAndTime()
     .def("totalNanoseconds", &DateAndTime::totalNanoseconds)
     .def("setToMinimum", &DateAndTime::setToMinimum)
     .def("__str__", &ISO8601StringPlusSpace)
+    .def("__long__", &DateAndTime::totalNanoseconds)
     .def(self == self)
     .def(self != self)
     // cppcheck-suppress duplicateExpression