Rainlendar 2.13 Beta 145

# Changes:
- Added advanced option to prevent the alarm from showing if there is a fullscreen window in front.
- The text edit controls were not hidden with the window.
- Double click on the empty text in event list opens now the editor.
- Rightmost column in the schedule was cut by the scrollbar.
- Math parsing failed on some locales when using '.' as the decimal separator.
- Event duration affects the priority of the appearance. I.e shorter events are drawn on top of longer ones.
- Completed date was not saved to non-recurring tasks.
- Manager did not show monthly recurring events correctly in current and upcoming views.
- Moving read-only events or tasks in the manager are copied instead.
- Vertical schedule calendar showed the events in incorrect locations.