* New: In cumulus/plugins.chip.powerplane, build the overall power
grid when there is a dedicated supply layer. Makes vertical
supply stripes and connect them the *horizontal* power rails
inside the blocks (could be in *any* layer).
Stripes positions are determined by the pins createds by
the pads module.
* New: In cumulus/plugins.chip.chip, use the powerplane builder
if the RoutingGauge provides a PowerSupply kind.
* New: In cumulus/plugins.block.configuration, add support for
PowerSupply gauges.
* New: In cumulus/plugins.block.pads, if the gauge provides a
PowerSupply, create north/south border pins for power & ground
to direct the corona to make vertical power strips.
This assume that we are using LibreSOC like I/O pads that
can be connected straight from everywhere in the corona.
First and last 2 stripes are "cap end" and narrower.
Positions and width of the sripes are set through the
configuration parameters:
* "chip.supplyRailWidth"
* "chip.supplyRailPitch"
* Change: In cumulus/plugins.block.spares, now take into account
the "placeArea" parameter.
* Change: In cumulus/plugins.block.bigvia, now have a per metal layer
area that *may* be expanded if it is too narrow to put at least
one cut. Add flags to allow controlled expansion of the metal
plates.
As a security, now raise an exception if no cut can be created.
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