* Change: In SegmentFsm::_slackenLocal(), in the Minimize state, when
the segment is fully blocked *and* has *lot* of candidate tracks,
that means that it is up against a *massive* blockage (i.e. a macro
block). In that case, try to move up (to go *over* it).
Previous behavior was to go straight to Inimplemented state.
* Change: In SegmentFsm::_slackenGlobal(), manage fully blocked
global segments. But finally, this configuration didn't arise.
* Change: In Manipulator::moveUp(), restore the management of the
AllowLocalMoveUp flag, to be able to move up local segments
(needed by SegmentFsm::_slackenLocal()).
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