Pkgcore

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- pkgcore.ebuild.ebuild: warn about deprecated ECLASS-VARIABLE tag (Ulrich
Müller, 337)

- pkgcore.ebuild: properly close resources (Thomas Bracht Laumann Jespersen,
339, 340)

- pkgcore.ebuild.repository: fix inheriting license groups. Fixes e.g. pquery
usage on overlays. (Arthur Zamarin, 341)

- metadata.xsd: sync with proj/xml-schema repository (Ulrich Müller, 342)

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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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