Test 2d to 1d.
Merge branch `test` into `master`.
Test 1D to 2d conversions.
Merge branch `test` into `master`.
Upgrade Proof to 0.0.47.

Closes #16.
Minimum height is 2.
Update minimum height for p2d.
Fix rotation calculations.
Converting distance to point works.
Merge branch `point` into `master`.