make_exit(spec,source,dest[,don't-really-create]) => a new exit
spec is an exit-spec as described in `help @dig'
set_names(object, spec) - sets name and aliases for an object
recreate(object, newparent) - effectively recycle and recreate object
parse_names(spec) => list of {name, aliases}
in both of these, spec is of the form
(as described in `help @rename')
as a child of newparent
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