Small helpers that the entry points of a package share with
hypothesis_BF_model(). hypothesis_alias_label() is the name under
which the rows of a hypothesis table show a tested parameter: the first
alias of the parameter other than its own name, or the parameter.
hypothesis_unique_named_warnings() drops repeated warnings of a
table (the same text for the same row).
hypothesis_alias_label(aliases, parameter)
hypothesis_unique_named_warnings(warnings)hypothesis_alias_label() returns a string.
hypothesis_unique_named_warnings() returns the unique, nonempty
warnings, or NULL without any.