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Add a scale for US aid grades.
It treats A# and C# as being part of the same scale, so that different grade contexts do not need to be assigned to neighbouring routes, e.g. if there is a grade with grade A2 next to a route with grade C1.
Aid + mandatory free is not covered by this commit.
Resolves: #79
I have separated this from my first (partial) impl in #93 in case someone wants to check the alternative.