This sets them up from the central UnitView.

Only works for a few commands (mainly page and section stuff).

- Adds new menu to page-bar, which shows issued change commands with a 
button to rollback the latest change.
- Added warning to the UI element that this is a experimental feature 
and can destroy units.
- Undo is done by having the normal function to apply the change to the 
unit-object and another to undo this change. The HistoryService manages 
the list and calling rollack (via UnitService).
- Further refactiring to the unit services.

- Encapsule into separate component
- No more pop-in-controls
- slicker ui layout
- More tooltip with explanations

This hack allows the page tabs to have a pseudo tab to create a new 
page.
This tab is disabled so the user can not change to it, but is still 
clickable.

Show accordion with expansion-panels instead of tabs.
This way elements can be grouped logically.

It did not do anyhting anyway. Is now integrated in unit view.