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formerly, replay could report success without signaling presence
of detached goals.

Should not happen anymore

This allows why3doc to generate anchors for operator definitions,
including "(*)".

Also fix session for isqrt_von_neumann

The factoring is recovered, the rest is not adapted.

The rest of this commit was discarded. It does not look to be adapted to
the Why3 testsuite.

Could be simplified.

# Conflicts:
#	examples/bitvector_examples/why3session.xml
#	examples/bitvector_examples/why3shapes.gz

fix obsolete sessions