splitword(1) on Linux

The text 60a31df93f8e, as Debian 3.0 (Woody), Debian 2.2 (Potato), Debian 2.1 (Slink), Debian 2.0 (Hamm) shipped it.

Collect several text-form dictionary files into a single file to make a <1 line / 1 word type / 1 candidate> format.