Explore or-groups for Recommends further than first

MarkInstall only looks at the first alternative in an or-group which has
a fighting chance of being satisfiable (= the package itself satisfies
the dependency, if it is installable itself is not considered).

This is "hidden" for Depends by the problem resolver who will try
another member of the or-group later, but Recommends are not a problem
for it, so for them the alternatives are never further explored.

Exploring the or-group in MarkInstall seems like the better choice for
both types as that frees the problem resolver to deal with the hard
things like package conflicts.

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