Fix Fuse/Wing/Stack override of wrong Tessellate method.
Correct transpose error in DegenGeom.

Joel's v2 code used a double[4][4] directly.  This error was introduced
when it was converted to use a Matrix4d instead.
Make mass properties calculation account for symmetry copies separately.
Make DegenPoint account for symmetric copies properly.
Allow mass properties calculations with only point mass in the model.
Make BlankGeom track its location in 3D space.
Improve handling of pt masses in MassProp and DegenGeom.

Also reformat tabs to spaces some DegenGeom code.