[7.0] Project stages update through statusbar don't trigger related actions

[Paulius Sladkevičius @ hbee]

Steps to reproduce the issue you have observed

1. Create a new task
2. Create child task (delegate) in draft status
2. Change task status/stage with statusbar widget to 'Done'

The result you observed

Task status changed to done. Warning that task have open child task didn't rise.

The result you expected

Task status changed to done. Exception window with error message "Child task still open".

More details

Function action_close() was not called, like it's done when push button 'Done'. It's same with other states too. So statusbar gives possibility to skip triggers. This problem brings problems to project_mrp module too, because it don't trigger workflow of procurements that should be done when pushing button, but if user push statusbar 'Done' action it thinking that it's same like pushing 'Done' button.