This is the COGO routine you will use to post a line. It computes the offsets of
points to a line defined by a point and a direction. It's like the Offset to
Alignment COGO routine for just a single tangent.
TPC computes the offset points and saves each one as a side shot from the original points. The side shot points have the same point label as the original point, but there is an 'OFS' added on.
TPC computes the offset points and saves them to their own traverse. The new traverse name starts with 'Offset Interval:', followed by the original traverse name.
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