View source for Shelve and Unshelve a WCU

<includeonly>=== Shelve and Unshelve a WCU ===</includeonly>
When a WCU is shelved it is disconnected from its car, if connected, and removed from its resource group, if any. In addition all active measure tasks are set to stopped pending and the system label ''shelving_in_progress'' is attached. This label will remain until all tasks for the WCU have status ''Stopped'' and all gathered measure data is uploaded to the portal after of which the label is replaced by the system label ''shelving_done''. In this final stage it is also possible to unshelve the WCU using the corresponding button and thus removing the ''shelving_done''-label. Note that when a WCU either has shelving in progress or is shelved it is no longer possible to add new measure tasks. 

It is possible to "Unshelve" one or multiple WCUs using the "Unshelve"-button in the Vehicles-tab. If the choices does not apply to the set of selected resources the button is disabled. It is possible to unshelve a WCU from any of the existing shelving states; shelving in progress, shelved, shelving refurbish in progress or refurbished. Note that the user must have the role '''wcu:shelving:write''' to be able to perform this operation.