Question List Mode implementation

This uses tabulated-list-mode to build the list of questions.
The actual content of questions is displayed on a separate buffer using org-mode (for now of course, this is not permanent).
No, that regexp won't match semicolons or spaces. So `&sometextwithoutspaces;` *does* match, but `&some text with spaces;` does **not**.
Do you think that's enough.