(1) Corrections to the R-C extraction code to better handle nodes
which have the recorded position at the corner of a split tile.
(2) Corrected "select area label" to prevent accidentally selecting
unexpanded instances in the area. Also corrects an issue with
not being able to select labels that are attached to "space".
(3) Changed the way that magic interprets the "sidewall" coefficient
so that it is entered into the tech file as the actual sidewall
coefficient instead of being half the value to correct for
magic's double counting of edges. The correction is instead
done when parsing the tech file. This measure was taken because
the open PDK values generated by "capiche" were not halving the
value, so I either change magic or I change all the tech files.
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