Clean task rule should remove local state of tasks as well

[oehme]

The cleanXXX tasks generated by the base plugin should not just clean the outputs of a task, but also its local state. I think this matches the user's expectation of a "clean slate" better than just removing the outputs, but leaving the local state lying around.

[lptr]

Hm, if we are not doing this already, that sounds like a bug.

[stale]

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[lptr]

We should do this.