Todo for merge

[codykarcher]

• update documention on runtime constratint construction to be more consistent
• merge constraint and runtime into one constructor
• standard output hook
• namespace hook (val, jac, hess)
• runcase function (not in black box)

[codykarcher]

Choosing not to merge Constraint and RuntimeConstraint constructors. Doing so would require more complex and less explicit code, and would also hide the distinction from the user, which I do not want. @blnicho