use weak reference to issue when registering for double click event
use weak reference to issue in change listener of issue cell
use weak reference to instantiating classes for listeners in parentissuesdisplaybox and labeldisplaybox
Merge branch 'master' of https://github.com/dariusf/HubTurbo into memory-leak
use weaklistchangelistener in ParentIssuesDisplayBox
use weakchangelisteners in IssueDialog
check that weakreferences are not gc-ed
fixed listchangelistener ref
use weakchangelistners in IssuePanelCell
Use weakchangelisteners in labeldisblaybox
use weakchangelisteners for labelslistcell
use weakchangelisteners for milestonelistcell
clear changelisteners before dereferencing affected components
merge
use weakchangelistener for singlechecklistview