refcard.tex: single file now includes what were formerly three files, to suit

refcard.tex: single file now includes what were formerly three files, to suit
             FSF preferences (format definitions, nee threecol.tex, and
             default font defs, nee rc-cm.tex, now both directly in this file).

lpsrc.sed, psrc.sed: alternate font defs, now sed scripts to modify refcard.tex

Makefile.in: use sed -f psrc.sed to produce refcard.ps target; new
             target lrefcard.ps for sites using long PS font names

Removed old auxiliary TeX files, no longer necessary with this scheme.