[Groff] PS fonts versions

[Michail Vidiassov]

Dear Werner,

one more reason for you to consider regenerating fonts for devps.

CR font now has Idot.

Idot is not in the original 229 Standart Character Set from PLRM v2.
Idot is not in the new      315 Standart Character Set from PLRM v3
 (it has Idotaccent).
Idot is not in the font used by Ghostscript for Courier
 (it has Idotaccent).

Thus the PS fonts described (some old Adobe fonts)
 are not standart,
 are not in wide use and
 are not free.

            Sincerely, Michail