Adding Boot::multiprecision as a DGtal::BigInteger model

[dcoeurjo]

PR Description

Adding boost::multiprecision for DGtal::BigInteger.

Checklist

• Unit-test of your feature with Catch.
• Doxygen documentation of the code completed (classes, methods, types, members...)
• Documentation module page added or updated.
• New entry in the ChangeLog.md added.
• No warning raised in Debug mode.
• All continuous integration tests pass (Github Actions)

[dcoeurjo]

ping @JacquesOlivierLachaud @troussil

[dcoeurjo]

Hi @rolanddenis , I may need your help with this PR (cc @JacquesOlivierLachaud )

This PR aims to include boost::multiprecision as a (header only) alternative to GMP for mutliprecision integer computations. DGtal::BigInteger are now enabled by default, and the backend can be switched to GMP if the user wants that.

I'm fixing a few issues related to WITH_GMP usages and I'm facing a problem in PointVector and the convert you did for explicit casts.

On this PR, if you have a look to

DGtal/tests/kernel/testPointVector.cpp

Line 136 in 4d040fa

auto p = p1 - p2;

the operator-() is not defined for DGtal::BigInteger. It seems to be related to ArithmeticConversionTraits you wrote a while ago.

Could you please help us here?

thx