emtrees – Draw labelled trees, using emTeX \specials

A small set of macros for draw­ing trees. The macros de­pend on the avail­abil­ity of emTeX\spe­cials; most in­stal­la­tions of dvips have these, but the out­put of the macros is un­likely to be us­able oth­er­wise, un­less you're us­ing emTeX it­self.