rk-1.7-bp151.3.1

- Update to version 1.7:
  * Added methods "beta", "gamma", "betaGamma", and "velocity" to
    the rk::Boost class.
  * Added function "rk::transformVelocity".

- Update to version 1.6
  * Added transverse() function to P4

- license update: X11
  The license described is X11, not MIT (see spdx.org/licenses/X11)

- Initial package (version 1.5)