Update boost - Part 1

[Pilot-Pirx]

This is a remake of the first part of Pedro Giffuni's original PR:
#194

[Pilot-Pirx]

Original comments from Pedro:

Minor cleanup to internal boost header packaging

We normally don't install all the headers available in boost. There is an
interesting set of functionalities like multiprecision and odeint that while we
are not using, but would be interesting to have available.

This is done to ease future boost updates but also in the hopes of making it
possible to use this functionality in a near future.

No functional change expected.

[Pilot-Pirx]

Let boost promote to double the sinc_pi() operation.

Modern processors should handle this without any trouble.