Defer line length problem.
Fix text view line length display with GTK+ 3.14.
Show external profile results as well.
Allow quitting before main loop is running.
Preallocate width for four characters.

This avoid a column resize and repaint when the view is fully loaded.
Avoid settings cursors and calling main_iteration too often.
Add gaupol.util.idle_add.

To simplify ensuring that the return value is False.
Fix floatlabel hiding.