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Instead, we put a "stop_split" over the subsequent postcondition
under the (begin > end + 1) assumption. When this assumption is
unrealizable (strict for), this allows us to discharge the whole
branch as a single goal.

We will want to use stop_split higher in the VC formulas.

Conflicts:
	examples/fibonacci.mlw
	examples/fibonacci/why3session.xml
	examples/fibonacci/why3shapes.gz
	examples/koda_ruskey/why3session.xml
	examples/koda_ruskey/why3shapes.gz
	examples/schorr_waite_via_recursion/why3session.xml
	examples/schorr_waite_via_recursion/why3shapes.gz
	examples/tests-provers/bv/why3session.xml
	examples/tests-provers/bv/why3shapes.gz
	examples/tests-provers/ieee_float/why3session.xml
	examples/tree_of_array/why3session.xml
	examples/tree_of_array/why3shapes.gz
	examples/vstte12_bfs/why3session.xml
	examples/vstte12_bfs/why3shapes.gz
	theories/int.why
	theories/real.why

The underlying Monoid does not need to be commutative,
and is indeed not in example fibonacci.mlw