Improve nested operations support

The idea is this: we need to be able to override "conditional, inner
for outer" recipes with the "unconditional inner" ones. Here is the
concrete scenario: we have {update, test} action and the lib{} target
that is both mentioned as a prerequisite of ./ and exe{}, which is a
test. At first, we want to ignore lib{} when reached as a prerequisite
of ./. But then we get to it via exe{} (which is a test and thus should
be updated). At this point we should override the recipe for lib{} with
the one that would update it rather than ignore.

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