By default, it is unchanged, still 256.
In those rare cases when users really need more lengthy
headwords, they could adjust the config file,
maxHeadwordSize parameter.
Previously the program could only safely find two-word compounds. Now it always
finds all of them, even if they are large sentences with many words.
To choose the source for compounds, a notion of dictionary features was added.
It may be utilized later for some more interesting things.