Introduced kamikaze-based succinct data structures

Added a package called succinct that groups implementations of some
traditional data structures that take advantage of algorithms
implemented in the core kamikaze package:

- P4DeltaSuccinctIntSet is a trivial PForDeltaDocIdSet wrapper
- S16SuccinctIntList is an order array-based list of integers that
takes the advantage of Simple16 data packing.