updated bitcoinrpc.cpp to use make_preferred() and removed double inclusion of boost/filesystem.hpp
updated bitcoinrpc.cpp to use make_preferred() and removed double inclusion of boost/filesystem.hpp

MidasPaymentLTD/midascoin,MidasPaymentLTD/midascoin,MidasPaymentLTD/midascoin,MidasPaymentLTD/midascoin,MidasPaymentLTD/midascoin