When placing a vertical M1 (and setting it's axis), the perpandiculars
M2 extremities changes, and they have a VIA. If they are already placed
too, they may silently create a stacked VIAs because the track markers
of the perpendiculars are not taken into account. Now, force to rip them
up so the markers will be re-read. If no stacked VIAs has been created,
the segment will be re-put at it's previous place, otherwise it will be
placed on another track.
* New: Track::hasViaMarker(), check if a marker of a Net is under a
given interval (so we can know we are about to create a VIA stack).
* New: Manipulator::avoidStackedVias(), ripup perpandiculars to the
current segment that *may* create stacked VIAs. That is perpandicular
in the *up* layer which begin or end on the moved vertical.
* New: In SegmentFsm::insertInTrack(), bindTotrack() & moveToTrack(),
call Manipulator::avoidStackedVias(), if activated.
* Change: In NegociateWidow/loadRoutingPads(), no longer exclude clock
nets. So the TrackMarkers are created for the root net.
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