* Change: In Cumulus/plugins/chip/PadsCorona, if the external pins of
the corona are in GCells that are also under the core block ring
power lines, they are flagged as "go straight" and this produce
impossible configurations for the router to solve. Now we ensure
that there is one free GCell all around the corona border.
* Bug: In Cumulus/plugins/chip/Configuration.py & PadsCorona.py,
at the begin/end of a side of pad, connectors can be outside the
corona range (i.e. not directly face to face). Now make a dogleg
if needed. This is a work in progress as if there are two of them,
they will short on the perpandicular part. We must compute a
shift.
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