change drag and drop pictogram

This new picto is commonly used as a drag grip.
cleanup drag-and-drop code

- Use of add_javascript hook to load lib only where it's needed
- Refactored redipsInit to take $type_$ordertype element as parameter in order to be reused more
  efficiently
add permissions check before updating item

TODO: This check needs to be enhanced with a tasks check because the package must not be updated
when a task using the package is already running.
add another check for consistency

- Checking $_REQUEST['orders_id'] since it's needed by the displayForm method
- Comments added to keep trace of question from me : too much params in displayForm ?
add more permission checks to deploy access
move package object creation where it's needed
remove unneeded CommonDBTM inheritance

Those classes doesn't have any table associated anymore therefore no need to inherit from CommonDBTM.
use Order object instead of just an ID
cleanup spaces at end of lines