solver3: Assume manual packages

If we have allowed the removal of manual packages, assume them
all before starting the solver. This should ensure that as long
as there is a solution that does not remove a manually installed
package, it is found.

This requires a sweeping set of changes in the test suite, but
ensures that we get "safe" behavior from the solver. We have
in particular seen that without asserting the installed packages,
several people ended up with ubuntu-minimal and perl removed in
a situation where that was not warranted, that is, they install
winehq, and then pull in some new perl packages in a newer version
than the installed one, and the solver chose to create a mismatched
version set, which then caused the main perl package to not be
installable.

Oops: 1b55173a-3526-11f0-b7ac-fa163e171f02
Oops: dbd5149e-36b9-11f0-bb74-fa163ec44ecd

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