Added the possibility to specify a period in the chart. 

This allows to set a period start and end date and a color, which will
result in painting a day line (like the current day indicator) at the
start and end date. Doing this a user knows in which date range he is
allowed to move events.
Added possibility to specify holidays in the gantt chart and
corresponding configuration of the color that should be used to render
them.
Added convenience getDate() method that takes a java.util.Date object as
parameter
Added the possibility to connect two GanttCharts where one is on top of
the other. On scrolling from left to right, both charts should scroll
the same way.
Added support to connect the zoom behaviour of different Gantt charts
Added support for custom placeholder support
Bug 413654 - added the shiftHorizontalCenteredEventString() method to
the ISettings interface and implemented it in the AbstractSettings to
return false to be backwards compatible.
Bug 413661 - added check and handling of images that are smaller than
the event height so they get centered
Bug 413700 - added getter for parent composite
Bug 413713 - modified drawText() to use regular expressions to determine
formatting tokens and switched from stringExtend to textExtend so the
tabs are recognized correctly. Also modified getSize() to use regular
expressions rather than subString().
Bug 413714 - draw the background for the bottom of the gantt chart as on
Win7 it would be transparent
Bug 413718 - Adding the possibility to configure if the text of an event
should be drawed or not. It is possible to configure this globally via
ISettings.drawEventString() or for every GanttEvent itself by setting
the property _showText
Bug 413744 - Add the possibility to configure that all selected events
should be dragged without holding the SHIFT key pressed.
Bug 413748 - Add the possibility to add events via context menu to the
GanttChart. This feature can be enabled via ISettings. If enabled the
context menu of the GanttChart will contain a new menu item for adding
an event. How it should look like can be configured via the newly
introduced IEventFactory.
Bug 413804 - Add possibility to add custom menu items to the context
menu of the GanttChart in general and the context menu of GanttEvents
Bug 413813 - Correct adding and removing GanttSections
Bug 413815 - Set the _preMove properties in GanttEvent to null if the
corresponding event values are null
Bug 413817 - Added check for _mainBounds to avoid NPE in
showScrollDate()
Bug 413819 - Change visibility of getSettings() and getHeaderHeight() to
public
Bug 413820 - Removed the selected event from the surrounding ones