add construtor.
add next0 method.
add trimToSize method to BitVector and next0 method to
SuccinctBitVector.
support LongsSuccinctBitVector.
add Constructor that receives String[].
change referenting class to more abstract one.
introduce nodeSize().
implement toString method.
clarify the meaning of argument.
add nodeSize.
merge TailLOUDSPPTrie to TailLOUDSTrie. refactor sbv.
fix ArrayIndexOutOfBoundException.