cubicweb-timesheet #1886615 add action to move activities to other open order [validation pending]

it can be useful to move a group of misplaced activities in the pending state from one workorder to another. provide an action menu for that (similar to "move to version" for tickets in the cube tracker).

done in0.7.0
load left0.000
closed by#c9d5d223d089 [views] move activities to other workorder (closes #1886615)