[cctbxbb] Boost Python 1.56

[Luc Bourhis]

Hi Richard,

> Is there any good reason not to move straight to the latest release, 1.60.0, assuming that everything builds/tests pass etc with that version? If we’re putting in the effort to move to a new version it makes sense to try the latest version, rather than some intermediate.

+1

I actually considered asking for at least 1.58 as I am interested in the new Endian library…

Best wishes,

Luc