Fixed javadocs problems.
Improved javadoc of all the classes. Extracted internal classes of the PoBOCSingleLinkAlgorithm.
fixed a stupid bug.
Fixed a stupid bug that caused wrong reports.
finally fixed graph building.
Improved reports and performances.
Updated with the last changes from DataMiningUtilities.
Removed useless call to System.gc(). Changed PoBOCSingleLinkAlgorithm report title.
Fixed a bug in the creation of the group's graph property.
Performance and stability tweaking.