Remove unplaced units when removing services.
Test that removing a committed service will remove unplaced units.
Only make one remove call and test update.
Display unit's name as a tooltip for unit icons on a machine token.
Merge pull request #560 from huwshimi/remove-unplaced-units-with-service

Remove unplaced units with service

Fixes bug #1368566: when a committed service is removed it should also remove unplaced units and their entries in the changelog.
Merge pull request #561 from huwshimi/unit-tooltips

Machine token unit tooltips

Display units' names as tooltips for unit icons on a machine token.