Issue #130: Add 3D linear referencing
Implemented functionality requested by Issue #130 (closed) to retrieve a segment of a specified (2D or 3D) LineString, between the specified fractional distances from the start of the specified LineString.
Implemented functionality requested by Issue #130 (closed) to retrieve a segment of a specified (2D or 3D) LineString, between the specified fractional distances from the start of the specified LineString.