rework `special' package names a bit.

- do a test to create partial-foo-1.0.1 instead of partial-partial-foo-1.0
when removing partial-foo fails.
- have .libs name generation, e.g., .libs-foo, then .libs1-foo, then .libs2-foo
instead of .libs-.libs-foo.... extend the pkgspec pattern slightly, so
that all these are more or less equivalent for dependencies and conflicts.

With this, we can do practically any scenario of shared libs updates and
downgrades.

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