fix broken HierarchicalTopology.boundary
fix coords().shape for geometry.ndims=1
make long-aware, implement 3x3 inv, add ones zeros
add TransformChain/Item, AffineTransform
fix bound instancemethod test
rewrite Rational, add Shift/Scale/Linear transforms
simplify Function evaluation
add canonical form for transform chains
Merge branch 'master' into transformwork

Conflicts:
	nutils/rational.py