Makefile.m4: Format each document in a subdirectory.
The recent change
f76fbef37b2af3292764729f496f578037cdc314 to
`sverb.dtx' prevents parallel formatting of /different/ documents from
interfering with each other, but I want to build PDF documents using
PDFTeX rather than going via `dvips' and `ps2pdf', and the two parallel
builds of the /same/ documents will still have the same `\jobname' and
therefore will fight over all kinds of temporary files -- not just the
demo files, but `.aux', `.toc', and everything.
~mdw / mdwtools / commit