Modify Far::TopologyRefiner refinement options

- move level of refinement / isolation into the Options structs
- fix splash damage in rest of the code

note 1: this is less than ideal, because most compilers accept the previous
        call to these functions with an incorrect parameter list (ie. passing
        the level instead of the struct issues no warnings and compiles...)
        caveat emptor...

note 2: the level parameter names may not be final for adaptive modes
        as we will likely want independent controls over crease vs.
        extraordinary vertex isolation.