As a data maintainer I want to be able to define which units are allowed for a given property with datatype quantity.
I only want to define the base-unit for a dimension and then automatically all the other derived units are also allowed.
See Template:Constraint:Units: must use one of the listed units (or novalue for no units allowed).
This ought to cover T132704.
- see README for adding a new constraint type in general
- this checker will need some unit resolver thingy injected – see RangeCheckerHelper (because we also want to accept millimetres if the constraint says metres)