200309 to do

1. Reorganise the normal (Gaussian) distribution along the lines of the multiState distribution.
2. Better costing of classification-trees.
3. Generalize the current 0-lookahead search for classification-trees to n-lookahead, n>0.
4. Add splitting and merging of components to the mixture-model search.
5. Look for places to make better use of the prelude functions, e.g. any, all, fold[l|r], min, max, repeat, scan[l|r], sum, zipWith, etc., to simplify the code.
6. Provide some simple I/O support, e.g. for `comma separated variable' files.
7. ...