EDIT

ref #9630: default value for enable description element source is true

ref #9630: fix time period disabling and supplemental data enabling

ref #8776: fix d&d check for duplicates

ref #8776: revert d&d check for duplicates

ref #8776: paste should only available if it is allowed.

ref #9629 adapting message string

ref #8776: fix d&d for not allow duplicates

ref #8776: disable allowDuplicate flag if tree contains duplicates

ref #8476: disable flat flag if tree has subtrees

ref #8476: do not allow d&d to a child