PlanarityConstraint creates redundant pointsets

[bbrelje]

Description

The planarity constraint class is added using a pre-defined DVGeo pointset. However, at the time the constraint is created, an exact duplicate pointset is added to DVGeo creating unnecessary overhead.

Steps to reproduce issue

See TODO in PlanarityConstraint init method

Current behavior

Creates duplicate pointset and adds to DVGeo

Expected behavior

Should use original pointset in DVGeo