Pkgcore

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- pkgcore.ebuild.repository: support inheriting use_expand_desc
and deprecated

- pkgcore.ebuild.eclass: support ECLASS_VARIABLE as a modern spelling
for ECLASS-VARIABLE

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- ebd: fix unpack command not working if called via pebuild(1)

- pmerge: make failure output more readable via color coding

- ebd: update ``econf`` in EAPI 8 to pass ``--disable-static``
as specified by the updated version of PMS

- pkgcore.sync.http: fix incorrect TLS context

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- ebd: fix PIPESTATUS verification for assert

- pkgcore.ebuild.eclass: add ABI_VERSION attribute to EclassDoc
to improve future compatibility between pkgcheck and pkgcore

- pkgcore.ebuild.profiles: do not emit errors for profiles deprecated
without a replacement

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- pkgcore.ebuild.eclass: calculate recursive PROVIDES in initializer
to include them in pkgcheck's eclass cache.

- pkgcore.ebuild.eclass: remove 'indirect_eclasses' backwards
compatibility attribute.

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- pkgcore.cache: Invalidate cache entries if they are missing INHERIT
key, to avoid false positives from pkgcheck's InheritsCheck.

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- pkgcore.ebuild.cpv: Explicitly handle invalid revisions.

- pkgcore.ebuild.eclass: Indicate variable types in generated
documentation.

- Fix unpack to decompress non-archive compressed files into the current
directory.

- Add support for recursive PROVIDES eclassdoc tag (replacement
for INDIRECT_ECLASSES).

- pkgcore.ebuild.eclass: Include PROVIDES in generated documentation.

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