Kvantor example prices portfolio of options (still dirty vers)
BlackScholesTests and so
Squashed 'Hopac/' content from commit 4aa886f

git-subtree-dir: Hopac
git-subtree-split: 4aa886fad9d81a29a1a3b083c145aca90a5289d8
Merge commit '01768f39d0b1e46f00395ce0d8f081cb9df0c3a6' as 'Hopac'