sg_lp_partition. Renamed to lpoint_partition

LPointPartition. Updated names
Line. Updated references
sg_column. Renamed to column
Column. Updated references
Column. Renamed to Colineation
Colineation. Updated references

Line. Updated references
SGPartition. Renamed to LinePartition
Partition. Updated references
SGShape. Renamed to Shape
Shape. Updated references

Subtraction tests. Began checking