Data handling

Normal classes:

DataSet1IterC	Iterate through a data set.
DataSet2IterC	Iterate through a data set.
DataSet3IterC	Iterate through a data set.
SampleIterC	Iterate through a sample.
SampleC	Sample of DataT's
SampleVectorC	Sample of vectors.
SampleDiscreteC	Sample of discrete objects.
DataSetBaseC	Data set base class
SampleLabelC	Sample of labels.
DataSet1C	Data set
DataSet2C	Data set
DataSet3C	Data set

Normal functions:

operator <<(ostream &,const SampleC &)	Output to stream.
operator >>(istream &,SampleC &)	Read from stream.