misc fixes/improvement on managed object schema editor:
- "move up" action is not displayed for the first property, so we should not display "move down" on the last property
- shouldn't "delete all" ask "are you sure?" before doing the actual delete
- wouldn't it be more convenient if "viewable" and "searchable" default values were "true" as we can expect it is the value most users will set on most of properties?
=> I reopen the task so that you get it back in your to-do but you can dismiss my requests or I/you can create other tasks/issues in Jira to handle them
This is a follow-up of