connection to a net that has been decomposed into a resistor array
cannot be found. This indicates some fundamental error in the way
extresist works. However, it should not be producing an invalid
and unsimulatable netlist. Instead, it makes an arbitrary connection
from the device terminal to the resistor array and adds an entry in
the output netlist (.res.ext file). This results in a poor
representation of the resistor network to that terminal, but an
otherwise simulatable netlist. A warning is issued to note that an
arbitrary connection has been made. This is most typically a
"garbage in, garbage out" situation in which insufficient information
exists in a layout to inform magic on which direction current is
traveling through a net. However, it should be possible to rewrite
the extresist code so that magic makes somewhat informed decisions
about current paths and produces a halfway decent representation of
the actual net, instead of just giving up on the detailed extraction.
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