#6 Status bar prompt is not functional

[Bernard Desgraupes]

The status bar command line can be opened with the key combo 'Esc X'. It has several shortcomings:
1. it does not get the focus ;
2. it does not execute the command when the Enter/Return key is pressed ;
3. it filters some characters and keys (like delete) which get directed to the current document window.

In one word, it is broken.

[Bernard Desgraupes]

I have fixed both [status prompt] and [status execute]. Bindings needed to be suspended. The commands can now be aborted by clicking outside the input field or by pressing Escape or Command-. (Command-period).
Committed to the repository (rev. 996).