FORCE L2 Root validation

[Benjamin Jakimow]

1. The L2 root shows a default folder that probably does not exist by other users (same for output folder).
2. The validation is done when clicking on the process button. This should could be done immediately, as it just requires a one-liner to verify if the specified directory exists
3. If the directory validation fails, the text box is marked with an red box (see screenshot below). That’s nice. However, in that case the “Select a directory” dialog” shows a couple of ugly looking red boxes as well.
4. Instead of “Select a directory” it would be nice to inform about the expected type of directory, e.g. “Select FORCE L2 Root directory”

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[Andreas Janz]

(1) done

(2) not sure if I want to add this level of complexity.

(3) created new issue #6

(4) done for Input and also Output directory widget

[Andreas Janz]

resolved #4

→ <<cset 76d02d3c6404>>