/// \return progress if a new word was found.
int spellCheck(DocIterator & from, DocIterator & to,
WordLangTuple & word_lang, docstring_list & suggestions) const;
/// \return progress if a new word was found.
int spellCheck(DocIterator & from, DocIterator & to,
WordLangTuple & word_lang, docstring_list & suggestions) const;