Abstract base classes for all DSC (Data Stream Clusterer) and DSC\_R classes.
The DSC and DSC_R classes cannot be instantiated 
(calling DSC() or DSC_R() produces errors), 
but they serve as a base class from which other DSC classes 
inherit.
Class DSC provides several generic functions that can 
operate on all DSC subclasses: 
print(), plot(), nclusters() to
get the current number of clusters, 
get_centers() to get the cluster centers,
and get_weights() to get the cluster weights 
(if implemented). get_centers() and get_weights()
are typically overwritten by subclasses of DSC. DSC_R 
provides these functions for R-based DSC implementations.
Since DSC objects often contain external pointers, regular saving
and reading operations will fail. Use saveDSC() and readDSC() 
which will serialize the objects first appropriately.
animate_cluster,
	cluster,
	evaluate,
	get_assignment,
	get_centers,
	get_weights,
	get_copy,
	microToMacro,
	nclusters,
	plot,
	prune_clusters,
	recluster,
	readDSC,
	saveDSC