[1.77] Requesting post-beta merges

From: John Maddock (jz.maddock_at_[hidden])
Date: 2021-07-15 16:52:30

I have some late changes I'd like to merge to master if possible:

For multiprecision, it's basically a single bug fix (for 
https://github.com/boostorg/multiprecision/issues/342), details here: 
https://github.com/boostorg/multiprecision/pull/344, note that the 
single CI failure is spurious.

For Math, the collected changes are here: 
https://github.com/boostorg/math/pull/661

The really big changes here are documentation, the remaining issues 
fixed are documented in the PR above.

There is one further change for Math, that I've neglected to cherry pick 
to the PR above, but it's this one: 
https://github.com/boostorg/math/pull/659 which fixes some invalid code 
that had slipped through.

Many thanks!  John.

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