Remove and Unpack operations should not be ignored for pseudo packages -

Remove and Unpack operations should not be ignored for pseudo packages -
they should trigger the remove/unpack of the "all" package.
Otherwise - as this package has no dependencies - it will be triggered
to late. The Configuration step doesn't need it as the "all" package is
a dependency of the pseudo-package, so it will be configured before
the pseudo packages are tried: So at this step the ignorance is okay.

Also IsMissing() should report the status of the all package if an
pseudo package is checked instead of always reporting no-miss.