Use tiering in the aptitude resolver to order returned solutions.

Right now the default tiers are:
  10,000 -> "safe" solutions containing only new installs, upgrades
            and "keeps".
  20,000 -> solutions that cancel all the user's actions.
  30,000 -> solutions that remove packages.
  40,000 -> solutions that break holds.
  50,000 -> solutions that install non-default versions of packages.
            (the subordinate tier is the version priority)
  60,000 -> solutions that remove Essential packages.

Still to do: add tier hints, add a way to set tier names, show tiers
and/or names in the UI (in place of the meaningless and confusing
score value).

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