makeplural/makesingular support for foo-at-bar (trunk only)
Suggested by Janet, after inhaling paint fumes. Unlike mother-in-law,
which is an entry in the hallucinating monsters list and would be pluralized
if chosen as a tin description, I think the rank title man-at-arms will only
ever go through plural/singular handling if used as a fruit name. But since
the man/men part was already implemented for pluralization, adding the -at-
part is trivial. Also adds men/man singularization for the general case
where -at- isn't involved.
projects / nethack / commit