More haskellish names for things

[Jacob Hinkle]

For instance, right now I have leftAct and leftMomMap, which might be a little more predictable as actl vs actr and momMapl. Just a thought, since it's probably worth making things fit the haskell style a bit more. I'm also renaming bundleSum as sumVB, keeping with the sumV for vector spaces provided by the linear package.