ENH: codedSource derives from option, not cellSetOption
See ep #189 (closed).
- e.g. vectorCodedSource needs e.g. 'selectionMode' since is a cellSetOption
- however this information is not/can not be used by the dynamic code
So instead:
- make CodedSource a generic fvOption instead of cellSetOption
- make codedFvOptionTemplate a cellSetOption