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Fix also pinning test cases to be more sane.

Handle properly per-name preference flags, and add test cases
for testing those via fix applet.

Implementing basic dependency handling, install_if and awareness
of pinning.

This reverts commit a2d873a7.

This reverts commit 84bfef1a.

We are having so many packages that they might overflow otherwise.
"ERROR: Preference overflow" was already reported.

It is incorrect optimization causing valid solutions to be skipped.
Any performance it might've gained, should be fixed by reintroduction
of the minimum penalty logic added in previous commit.

Basic per-name per-package specific scoring added.

Enabled when all attempts to satisfy a name failed, we know that we
can ignore all decisions until we find a decision affecting the name
we wanted to satisfy.

apk_name_state is now quite small; and we avoid overhead of two
pointers (+ malloc overhead) when we just make it part of apk_name.
It also fixes some problems (that got introduced) where apk_name_state
was not allocated.