simplify solve_dependencies: always compute to_install array (it is

reasonably cheap). Remove else conditions, use next: after all, it's
a simple pattern, try one solution after the other until one succeeds.
Pass state to access replace: in that case, first try the list of
packages to install/update so that we force them into proper order.

Add a mark to handles for finished packages: with -r, we can no longer rely
on installed packages to avoid doing the work twice.

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