The grid engine was the default and its copper is not checked against exact
shapes: a full reroute of the Labrador lid with no flags came out with 15
tracks_crossing and 87 clearance violations under KiCad's DRC while the
report listed only unrouted connections. The exact engine (what mckicad and
every benchmark already use) is now the default, and grid or room runs end
with a warning that their output needs a DRC.
rsp2k
33de21ba0e