Adds an up- and a down-button, also move the code of the add-button.
Adds a text line above the service-list about the up/down-button
Makes the up/down-button unenable if the selected item is in the
top/bottom of the list
Makes the gray-out of the up and down buttons behave as expected.
Merge pull request #16 from KlasJoenssson/Bug3485

Adds buttons to sort the items in the service list