- Change prodnodatalabel -> nodatalabel
- Rename private class member with naming convention.
- Change writeContingencyTable to WriteContingencyTable.
- Change initialization m_RasterizeReference.

ENH: Since GetContingencyTable() is not a simple getter (it computes new things), change name to less ambiguous BuildContingencyTable()

Now input vector with class is required for unsupervised classifier.
The cases where input vector data were optional for unsupervised
classification are commented.

This allow to have only one application to handle bot supervised and
unsupervised classifier.

Classifier category is retrieve with selected classifier and depending
this category some operation are added/removed for the training.