Added Ole.hs.
Merge remote-tracking branch 'osandbu/ghc-api' into ghc-api
WIP. Starting to look at using Control.Lens.Zipper to manage the
TokenUtils tree.
Inching forward on my understanding if Control.Lens.Zipper
ZipperPlayLens.eg2' finally seems to be doing what I want, in terms of
traversing and editing the tree