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Boost version cleanup analysis

This document summarises the consequences of removing old Boost versions from the builtin recipe, at two candidate cut-off points. It covers:

• which other packages in the builtin repo depend on the removed versions,
• what can be simplified in repos/spack_repo/builtin/packages/boost/package.py, and
• notable bugs and milestones in the removed range.

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Experiment: replacing #edge target compatibility with a Python propagator

Background

The solver/edge-for-target branch introduced a #edge directive to enforce target compatibility between non-build dependency edges:

#edge (node(Y, Dependency), node(X, Package)) :
 attr("depends_on", node(X, Package), node(Y, Dependency), Type), Type != "build",

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