Convert to use li layer in pgates.
Fix multifinger devices with li layers.
Simplify wordline driver input routing.
Fix power pin direction option update.
PEP8 cleanup
Changes to simplify metal preferred directions and pitches.
Split of control logic tests.
this can take considerable amount of time, so the user knows that
useful work is done.
Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>