- reader mit mehr als 9600 baud wird nicht erkannt. Serial Port setup ist wohl nicht so korrekt.
- remember binary mode in preferences

- ascii cols are interpreted as UTF-8 by pango
- set background of edited cells
- cell editor with monospace font

- editing immidiately writes to tag. But writing should only occur after pressing some write button
- when Tag/Load tag is immediately overwritten

+ then test modified sector trailer which activates keyb
+ decypher bits in sector trailer from table below
  ~ DataSheet-FunctionalSpecification.pdf page 13..

Sector Trailer |
---------------+----------------------------------------------------
FF 07 80 xx    | KeyA is master key with full access, KeyB disabled
---------------+----------------------------------------------------
               | Block0 | Block1 | Block2
---------------+--------+--------+--------
08 77 8F FF    |   V    |   V    |   V
48 77 8B FF    |   V    |   V    |   D
28 77 8D FF    |   V    |   D    |   V
68 77 89 FF    |   V    |   D    |   D
18 77 8E FF    |   D    |   V    |   V
58 77 8A FF    |   D    |   V    |   D
38 77 8C FF    |   D    |   D    |   V
78 77 88 FF    |   D    |   D    |   D
