gen.sh: create separate troff fonts for font features
trfn: add trfn_subs() to support otf features
trfn_ch.h: merge \(no and \(-,
trfn: support arabic and arbitrary ligatures
gen.sh: for creating a neatroff output device
mktrfn: show a summary of options
trfn: print a message if glyphlist.txt cannot be found
trfn: print special line with -s
trfn_ch.h: more arabic aliases
mktrfn: otfdump and improved afm support