Log Message:
Import textproc/DWB as DWB-20150517. From Carsten Kunze via pkgsrc-wip.

The Documenter's Workbench (DWB) Release 3.3 is AT&T's original software
distribution of nroff and troff (ditroff), the preprocessors tbl, eqn, pic,
and grap, and the macro packages man, ms, and mm.