#45 It is not obvious how to move events vertically

[Rickard Lindberg]

This can be done by selecting an event and pressing Alt+Up/Down.

Unless you read the documentation, you don't know how to do this.

[roger lindberg]

Made the Up/Down keys move a selected event vertically.
That should be more obvious.

[Rickard Lindberg]

Also added menu items where the shortcuts are displayed along the menu items.