* Bug: In <rds>, in rfmaccess.c viambkrds(), the holes of the BIGVIAs
are aligned on a design-wide matrix to allow two overlapping BIGVIAs
to have their holes exactly at the same places (one consequence is
that the holes of a BIGVIA may be off-center).
But, if the BIGVIA is "too small", that is, it's area cannot
accomodate at least one "on grid" hole, it silently replaced by a
default (i.e. minimal size VIA). In that case you may endup with
a mixture of BIGVIA (when the hole is aligned) and default VIA,
when it is not... The fun part, is that it is DRC correct, but
looks messy.
To avoid this, we systematically use the default VIA when the
side of the BIGVIA is less than two holes wide (in either direction).
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