Metric SLAM algorithms

// classes

class mrpt::slam::CMetricMapBuilder;
class mrpt::slam::CMetricMapBuilderICP;
class mrpt::slam::CMetricMapBuilderRBPF;
class mrpt::maps::CMultiMetricMapPDF;
class mrpt::slam::CRangeBearingKFSLAM;
class mrpt::slam::CRangeBearingKFSLAM2D;