Fix ambiguous typedef build error on Windows (these are defined in the header)

Author: tveasey

lib/maths/CPeriodicityHypothesisTests.cc

@@ -61,8 +61,6 @@ using TSizeSizePr = std::pair<std::size_t, std::size_t>;
 using TSizeSizePr2Vec = core::CSmallVector<TSizeSizePr, 2>;
 using TMeanAccumulator = CBasicStatistics::SSampleMean<double>::TAccumulator;
 using TMeanAccumulatorVec = std::vector<TMeanAccumulator>;
-using TFloatMeanAccumulator = CBasicStatistics::SSampleMean<CFloatStorage>::TAccumulator;
-using TFloatMeanAccumulatorVec = std::vector<TFloatMeanAccumulator>;
 using TMeanVarAccumulator = CBasicStatistics::SSampleMeanVar<double>::TAccumulator;
 using TMeanVarAccumulatorVec = std::vector<TMeanVarAccumulator>;
 using TTimeTimePr = std::pair<core_t::TTime, core_t::TTime>;