Improve FMMLIB numerical stability for Laplace 3D

See merge request !81

Faster 3D M2Ls using precomputed rotation matrices

See merge request inducer/boxtree!79

This reverts commit c7941039.

subclass's geo_data to None

of bounds writes and overflow

Fix, test draw interaction lists

See merge request inducer/boxtree!80

rotation class builder algorithm that doesn't rely on radix sort.