Entertainer and presidential hopeful Michael Flatley has been ordered to pay security for costs in a multimillion-dollar suit over hazardous chemical residues allegedly found at his period property, Castlehyde in Co Cork. The successful application was brought by the insurers and building contractors he is suing over concerns that the Riverdance star lives outside of the EU in Monaco, and they will face difficulty in executing any costs orders made in their favour should they successfully defend the proceedings.  The ruling means Flatley will have to lodge money as a surety (the amount will be decided in November), before his…