Extended the "projectMemberStore" for members of sub-projects.
  This is necessary in the case that tickets or tasks have been
  "moved" to the current project, violating the invariant that
  a member of a sub-project is also a member of the main project

  Removed invalid options from configuration

  - Fixed issues creating new tasks by providing
    new tasks with material_id and uom_id values
  - Fixed issue deleting task. If you delete the
    last task of a parent, the parent will become
    "demoted" to a normal task again

  - Now dealing with duplicate task names

  - Changed Gantt structure to exclude the main project_id as root
  - New tasks now receive new object_ids from the server

  - Added renumbering of sort_order after moves, inserts or deletes
  - Moved redraw() into onIdle event for lazy/delayed redraw
  - Fixed help menu
  - other minor changes

  Added scheduling menu with "Manual Scheduling" as only option

  Fixed syntax error in check if the project is a Gantt project

  Show only for Gantt projects

  Fixed issue creating tasks

  Now disabling the resizable edges when maximizing the editor

  Now drawing reasonable milestones and tickets (when there is no end-date)

  - Fixed bug when some tasks have no start- or end-date

  - Deal with empty start- and end-date when drawing
    gantt bars

  - Now disabling browser scroll bars after
    maximizing the GanttEditor window

  - Fixed "Save" button

  Now showing tasks with zero width as milestones

  - Optimized redraw-performance after expanding/collapsing tree nodes
  - Implemented vertical scrolling

  First results from scrolling, even though the GanttBarPanel
  doesn't have the right vertical size yet

  Fixed Alpha Menu

  - moved PO.class.CategoryStore to PO.store.CategoryStore
  - Added a PreferenceStateProvider.js based on SenchaPreference,
    that still needs debugging

  - Continued refactoring code
  - Moved ResizeController to sencha-core, because
    it is a reusable part
  - Fixed issue with GanttBarPanel surface.size

  Reorganizing source

  Moved controller to GanttEditor

  - Reorganized files into local library for GanttEditor
  - Moved Tree related events into a GanttTreePanelController

  Simplified load pathes

  Cleaning up code

  - Fixed more date issues for Firefox
  - Switched to MS-Project style dependency arrows

  - Now runs on FireFox after fixing data parsing issues

  - Moved GanttBarPanel to library (not sure that's right...)
  - Fixed syncroneous loading issue with several panels
  - Added debug to all important elements

  Merged changes from Klaus for maximize/restore

  Fixed initial project scaling

  - Adapted to new end_date semantics
  - Added custom conversion functions for
    PostgreSQL date format

  - Changed dependencies to be stored with task information
  - Fixed dependency direction