Minor documentation update.
Two new options for customizing separators in analysis strings.

        One of the options allows plus `+' separated analysis symbols
        instead of angle brackets used by default. If enabled, for
        example, we get analysis string 'test+N' instead of 'test<N>'.

        The other one causes subcategories to be treated like other
        features (for example, the pronoun sen will be analyzed as
        sen<Prn><pers><2s> instead of sen<Prn:pers:2s>).
Another bugfix in automatic dependency generation.
A new lexicon for non-punctuation symbols.

        This adds a small lexicon for symbols that are not
        punctuation, like symbols used for math and currency symbols.
        Currently we still tag them as punctuation, probably it is
        they will get their own categories (and possibly
        subcategories) with the first tagset review.