* Bug: In Interval::intersect(), bad condition check in strict mode.
* Change: In Occurrence::operator<(), change the sorting criterions
so that the ones with no paths are "lower", then the one with
no entities, then compare entities Id then Path hashes.
* Change: In Occurrence::getCompactString(), to be more readable,
suppress leading and ending "<>".
* Change: In IntervalTree, now use an IntervalDataCompare to control
the ordering of the nodes inside the tree. This may be needed
when IntervalData is build upon a pointer, we don't want to
sort on pointer values (non deterministic) .
* Bug: In IntervalTree::postRemove(), there was an incorrect computation
of the updated childsVMax.
* Bug: In IntervalTree::beginOverlaps(), miscalculated leftmost
interval overlapping.
* Bug: In RbTree::remove(), when exchanging the removed node for a
leaf, fully swap the nodes contents, was incompletly copied before.
* New: In CellWidget, add new slots selectSet(OccurrenceSet&) and
unselectSet(OccurrenceSet&), to be able to select/unselected sets
of Occurrence (for use by TabEquipotentials).
* Change: In EtesianEngine, no more need to remove leading/ending "<>".
* New: In Tramontana, use a Query to find all the Occurrence under
an area. Previously we were using Cell::getOccurrencesUnder()
which *do not* return the components in instances, so we would
have been unable to find trans-hierarchical shorts circuits.
* New: In tramontana, now use a Relation to tag all the components
belonging to an Equipotential.
* Change: In Equipotential, store everything under the form of
Occurrence, instead of Components. Due to the way the Occurrences
are sorted, the one holding Components should be firts.
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