Add a 2:1 incline side and middle roofline for the top half of the node

A copy of the rooftop_lowmiddleside and rooftop_lowside, but moved to the upper half of the node space (so roofline can be continuous
Merge pull request #2 from dgm3333/master

Add a 2:1 incline side and middle roofline for the top half of the node commit from dgm3333