Initial commit.
Start over with initial type-class defs for monomials.
Basic polynomial impl, using separate coef and mon vectors.
Remove Poly.rs
Some work on rect mesh, basic cubature integration.
Implemented value_at and value_at_for_origin functions.
Add rectangle integrable trait.
Add description for integral function.
Added pow() function.
Move rectangle integration funs into rect mesh.
Rect mesh integration functions implemented, some signatures changed and functions split.
Added scratch, lib/.
Renamed rect integrable trait.
Removed some unused members and rearrange things a bit.
Remove obsolete comment.
More unit tests.
Merged from new Github repo.