Added a private tools header
Added a private tools header

- currently contains implementationf or unsigned integer based
  greatest-common-denominator and least-common-multiple algorithms
  These are used to finding suitable alignment values for non-trivial
  combinations of chunk_size and alignment in MemPool

SixTrack/SixTrackLib,SixTrack/SixTrackLib,SixTrack/SixTrackLib,SixTrack/SixTrackLib