NEWS update and return type changed for prune_tree method
CART class structure added w/o implementation
Merge pull request #2230 from mazumdarparijat/C45

Minor changes in C4.5
Merge pull request #2231 from mazumdarparijat/CART

CART class structure added w/o implementation
Tiny little typo in valgrind.supp
minor fix
Merge pull request #2237 from yorkerlin/yorker-integration

minor fix for Integration.cpp
CMultilabelSOLabels class added