pyscaffold / configupdater / #226

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Detach blocks when cleaning containers

Blocks hold a reference to their containers, so if someone for some
reason is keeping a reference to a block, it would be nice (for the sake
of consistency) to guarantee that block does not hold a reference to its
former container if that container is emptied via `.clear()`

There is another aspect: Python GC is based on reference counter... I
don't know if keeping references around in the blocks might interfere
with that also.

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