All *.old files are from DWB 2.0 and are not
used in UNIX PC version.
The macros.mk makefile does not make the man macros (an, an6,
tmac.an, and tmac.an6).
New 11.47 version of mmn used for UNIX PC DOCUMENT PREPARATION 3.51
 to fix bug in the
11.45 version used in DWB 2.0 (bug caused memo macros
to fail when neqn used on nroff document.  Mm macro added
a break ".br" whenever it encountered .EQ in the file, messing
up .AU, .TL, .MT, and .SG.  New mm only puts in break if on second
or later pages.  Problem arises because neqn puts a .EQ - .EN block
at top of document which contains the break request, 
and the other mm macros don't want anything ahead of them at the top
of the first page.)
