Missing include breaks compilation on Visual C++ 2017 #462
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Hadn't tested on Visual C++ 2017 for a while and, as is always the way, standard library header files are subtly different so an additional include was required. Once Alicia has finished with it I think I might get Paul to reformat my old machine for Windows CI - at one point Stefan had a Windows machine but I think he had a traditional mid-PhD Linux-conversion.