makefile macrostepper

[nverno]

Hi, I figured I would link this macrostepper for makefiles, since I find that I use it all the time for expanding makefile variables. It will get confused by various complications but I find it useful enough for my purposes. You mentioned on the previous julia macrostepper you'd
be interested some sort of linkage between extensions, so I figure I would throw it
out there. Unfortunately I havent used julia in some time so haven't looked at that
one in ages.