- ESC=       - Keypad Application Mode
- ESC>       - Keypad Numberic    Mode
- ESC[?25h/l - Cursor on/off

- Implement TAB setting and deleting.

- Implement UNDERLINE/BOLD/ITALIC.
  Fails to display BOLD characters with black foreground.
  'bold' is broken currently for default colors.

- check for other VT102 features
- complete documentation
- correct/test emulation so far
  
- History Buffer
- Scrollbar

- Command line options

- ...?

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reintegrate to Kom

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- switchable 80/132.
  This is experimental in the moment (but deactivated).
  Although nice for vttest it may well cause problems
  when an application using it does not (and momentary
  cannot reset to flexible mode).
  Further, parts of the active screen may become invisible,
  causing confusion. (Could eventually be handled by a scrollbar).
  Although it works (somehow), the state of this feature is
  clearly _experimental_.
  FIXME: when the cursor is covered/uncovered by resizing, it is
         not shown in the moment.
  NOTE: one can expect this feature to be of few use anyway,
        so the priority is very low.
