Features: Erase method for Multiset now remove only one instance of the element similar to iterator erase( iterator pos ) for c++ data structure std::multiset.

[Alessandrostr95]

In details, the new features are:

• Multiset: Changed Erase method to remove only one instance of the element (not all of them) similar to iterator erase( iterator pos ) for c++ data structure std::multiset.
• Multiset: Added EraseAll method to remove all instances of the element. It replaces the previous implementation of Erase method.
• Multiset: Added Count method that returns the number of instances of the element in the multiset.
• RbTree: Added Compare method that compare two keys w.r.t. the comparator of the tree.