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one-dimensional arrow, line and link
TODO:
- [x] switch to use applyFrameAnchor
- [x] vertical tests ?
- [x] restore errors when both x and y are missing?
- [x] update documentation
closes #1541
It might be too disruptive for the case of lines—adding a feature at the expense of clarity (like, a good error message when people forget to specify x or y). Should we punt on that part?