The built-in repair functions.
A repair fn must take a HGVS string and an inferred kind, and return a
repaired HGVS string. e.g.
(if (= kind :protein)
(clojure.string/replace s #"EXT" "ext")
The built-in rules are based on frequent mistakes in popular public-domain
databases such as dbSNP and ClinVar.