EP_Name ($30) - Copy File entry name to buffer at (CDE)

IN:
     A = EP_NAME
   CDE = buffer to hold returned filename, (C = 0, local pointer)
   BHL = pointer to Eprom File Entry in card (B contains embedded slot mask)

OUT:
   Fc = 0, File Eprom available
        Fz = 1, File Entry marked as deleted
        Fz = 0, File Entry marked as active
        A = length of filename
        (CDE) contains a copy of filename, null-terminated.

   Fc = 1,
        A = RC_Onf
        File Eprom was not found in slot, or File Entry not available

Registers changed after return:
   ..BCDEHL/IXIY same
   AF...../.... different