[JENKINS-20008] Using DirectlyModifiableTopLevelItemGroup.
ItemListener.fireOnDeleted
[JENKINS-20008] Using DirectlyModifiableTopLevelItemGroup.remove.
[JENKINS-18680] Comments.
Adding an action to move items such as jobs and folders.
Includes a simple synchronous implementation using Items.move,
and an extension point allowing plugins to contribute other behaviors.
API actually merged toward 1.548.
Making RelocationHandler an abstract class as suggested by @kohsuke in #2.
Use a wildcard to indicate that a list is read-only.
I18N.
Fixing some test failures caused by updating to current Jenkins dev builds.
Merge branch 'folder-moving'