Gantt Editor

  because the old name could be ambigous with GanttEditor and others

  reporting an error

    if exists

  These users are supposed to be candidates for budget item managers

- Added "remaining value" field in budget tree, showing
  budget value - actual
- Started to add a field with the BI members = managers

  The expanded values needs to be a plain true/false without double quotes around

- Added the ResizeController from GanttEditor to support
  maximize/normalize buttons

  but not yet passing menu filter select to filter fn

  only selected cost types used for budget management

  selected and a selected item

- Convered preferenceStore to singleton so that it can
  be shared with other Ext portlets (Gantt Editor)