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- Add support for validating SLOT values, used by pkgcheck to flag invalid
SLOTs and pkgs with bad SLOTs will be automasked.
- Add initial profiles/package.deprecated support to flag deprecated packages
by pkgcheck.
- pclean pkg: Add initial -c/--changed option that allows for scanning the
related ebuilds for given attribute changes and flagging binpkgs for removal
if changes exist.
- Add py3.8 support.
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