DRC rules. The substitutions are specified by "%d" for the main
rule distance, "%c" for the corner rule distance (sometimes
interpreted differently; e.g., as width in the widespacing rule),
and "%a" for rule area (e.g., maxarea rule). In addition to
simplifying the process of writing rule violation strings, the
benefits are twofold: (1) The output is in meaningful physical
units, but in the case of SCMOS technology, will scale properly
depending on the selected GDS output style, and in the case of
all technologies, will scale properly with internal grid division;
and (2) when using lambda, but where rules are given in vendor
minimum dimensions, the rules will be based on the lambda rule
approximation (that is, distances will be rounded to the nearest
lambda but reported in microns). Behavior is unchanged from
previous versions for "why" strings not using the defined
substitution sequences.
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