Two MC viewer parity gaps closed:
Buttonbar: now shows different labels in Hex mode (F2=Edit,
F4=Ascii, F6=Save, F7=HxSrch, F8=Raw) matching MC's hex display.
NroffMode: F9 now toggles nroff_enabled (MC CK_NroffMode).
Previously F9 opened the menubar; the menubar moves to Shift-F9.
The buttonbar label for F9 shows 'Nroff'.
Text mode buttonbar also shows 'Nroff' for F9 instead of blank.
Tests: 1421 pass, zero warnings.
vasilito
ffc4b3cc6e