-- Added new option to set new parent project when cloning. This was necessary because we
   added a sanity check that would users not allow changing the customer
   of a sub project.
-- Added new option: Parent Project
-- im_project_clone: added new parameter parent_project_id
-- Show sub-projects in select
-- additional validation when changing parent project - customers of parent project and project need to be identical!
-- added exception to limitation that customer ca change client. He shoudl be allowed to do so
   in case he also changes the Parent Project. This scenario is quite common when cloning projects
-- db_string instead of db_1row to cover use case "New Project"