Prepared struct node for stacks of shadow nodes

So far dynamic translator stacks were created in the following
fashion: nsmux created a shadow node on which the whole
dynamic translator stack was built. This commit starts the
transition to a different strategy: the new approach consists
in setting *each* dynamic translator on its personal shadow
node. To achieve such functionality the set of fiels of struct
node was modified and the bits of code that manipulated these
fields were stripped out. The code is not functional now. The
coming commits will bring it back to life.

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