added more verbosity, and now throwing error when encouterning NaN/inf
added more verbosity, and now throwing error when encouterning NaN/inf

fplll/fplll,shi-bai/fplll,fplll/fplll,dstehle/fplll,shi-bai/fplll,shi-bai/fplll,fplll/fplll,fplll/fplll,cr-marcstevens/fplll,fplll/fplll,cr-marcstevens/fplll,cr-marcstevens/fplll,shi-bai/fplll,cr-marcstevens/fplll,dstehle/fplll,dstehle/fplll