Add support for modular build structure.

[grafikrobot]

This is part of the effort to make the Boost libraries "modular" for build and consumption. See https://lists.boost.org/Archives/boost/2024/01/255704.php and https://github.com/grafikrobot/boost-b2-modular/blob/b2-modular/README.adoc for more information.

This PR depends on the following other PRs being merged to both develop and master branches of the respective repos:

• Add support for modular build structure. boost#854

This PR will be changed to ready for review, i.e. not draft, when the above are merged. Do not merge this one until that time.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.37%. Comparing base (48ff7b9) to head (44589d8).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop      #88   +/-   ##
========================================
  Coverage    99.37%   99.37%           
========================================
  Files          168      168           
  Lines         6702     6702           
========================================
  Hits          6660     6660           
  Misses          42       42           

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 48ff7b9...44589d8. Read the comment docs.

[grafikrobot]

Please review and merge this PR at your earliest convenience.

[mborland]

Is this now boost_odeint instead of boost_numeric_odeint? In build.jam that alias seems to point to the former.

[grafikrobot]

Is this now boost_odeint instead of boost_numeric_odeint? In build.jam that alias seems to point to the former.

Yes. I normalized all the B2 global project names to /boost/<repo-name>. As it allows for consistent search of the projects once this is used in package managers (or manually) that will key on the repo name instead of the location in the super-project.