Aim of the talk: Show that allowable modifications of a fixed toroidal embedding correspond to
decompositions of the corresponding conical polyhedral complex.
Details: II, §2 give Definition 1, Theorem 1*, 3*, 4*, Definition 2 and 3 and
Theorem 6*, 7*, 8*. Skip all the proofs, but point out the analogy of the *-Theorems
with their non-*ed counterparts in I,§2 (which we discussed in the talks 2,3,4).