* Change: In Hurricane::QuadTree_GosUnder::Locator::progress(), directly
prune the elements which sizes are under the threshold. This allows
the too small Instances to be directly skipped. This was the key
point slowing the walktrough. We were systematically going through
all the instances (that is consistent with the perf traces).
* Change: In Hurricane::Cell_OccurrencesUnder, add a threshold parameter
to pass on the QuadTree (through getInstancesUnder()).
Needed for the CellWidget selection to have the same problem as
the display itself (select only what is displayed).
* New: In Hurricane::CellView, add two new parameters:
1. "viewer.minimumSize" set the original size of the window, in pixels.
(doubled for HiDPI).
2. "viewer.pixelThreshold", the size, in pixels, under which
components/instances will not be displayeds.
* New: In CRL/etc/cmos.misc.py, added parameters "viewer.minimumSize"
and "viewer.pixelsThreshold".
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