The GR_FONTENC_CP437EXT font encoding is a custom encoding
that cover CP437 + ISO8859-1 + CP1252 (by now)

# Unicode equivalence for the 322 glyphs
# in CP437EXT encoding
#
# 00-1F => same as in CP437
---- 263A 263B 2665 2666 2663 2660 2022
25D8 25CB 25D9 2642 2640 266A 266B 263C
25BA 25C4 2195 203C 00B6 00A7 25AC 21A8
2191 2193 2192 2190 221F 2194 25B2 25BC
#
# 20-7F => ASCII
  20   21   22   23   24   25   26   27
  28   29   2A   2B   2C   2D   2E   2F
  30   31   32   33   34   35   36   37
  38   39   3A   3B   3C   3D   3E   3F
  40   41   42   43   44   45   46   47
  48   49   4A   4B   4C   4D   4E   4F
  50   51   52   53   54   55   56   57
  58   59   5A   5B   5C   5D   5E   5F
  60   61   62   63   64   65   66   67
  68   69   6A   6B   6C   6D   6E   6F
  70   71   72   73   74   75   76   77
  78   79   7A   7B   7C   7D   7E   --
#
# 80-FF => same as in CP437
#
00c7 00fc 00e9 00e2 00e4 00e0 00e5 00e7
00ea 00eb 00e8 00ef 00ee 00ec 00c4 00c5
00c9 00e6 00c6 00f4 00f6 00f2 00fb 00f9
00ff 00d6 00dc 00a2 00a3 00a5 20a7 0192
00e1 00ed 00f3 00fa 00f1 00d1 00aa 00ba
00bf 2310 00ac 00bd 00bc 00a1 00ab 00bb
2591 2592 2593 2502 2524 2561 2562 2556
2555 2563 2551 2557 255d 255c 255b 2510
2514 2534 252c 251c 2500 253c 255e 255f
255a 2554 2569 2566 2560 2550 256c 2567
2568 2564 2565 2559 2558 2552 2553 256b
256a 2518 250c 2588 2584 258c 2590 2580
03b1 00df 0393 03c0 03a3 03c3 00b5 03c4
03a6 0398 03a9 03b4 221e 03c6 03b5 2229
2261 00b1 2265 2264 2320 2321 00f7 2248
00b0 2219 00b7 221a 207f 00b2 25a0 ----
#
# 100-128 => glyphs to complete ISO8859-1
#
00a4 00a6 00a8 00a9 00ad 00ae 00af 00b3 
00b4 00b8 00b9 00be 00c0 00c1 00c2 00c3 
00c8 00ca 00cb 00cc 00cd 00ce 00cf 00d0 
00d2 00d3 00d4 00d5 00d7 00d8 00d9 00da 
00db 00dd 00de 00e3 00f0 00f5 00f8 00fd 
00fe 
#
# 129-141 => glyphs to complete CP1252
#
     20ac 201a 201e 2026 2020 2021 02c6
2030 0160 2039 0152 017d 2018 2019 201c
201d 2013 2014 02dc 2122 0161 203a 0153
017e 0178

