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Updated XMLDoc documentation.

XMLDoc commented unit.

Added support for General Preferences "ShowEmptySections" option to display empty section headings. Overview tree view now displays all possible section headings when option is set or hides empty sections when option cleared.

* Renamed general preference ShowEmptyCategories as ShowEmptySections.
* Changed name of corresponding IPreferences property to match.
* Updated FrGeneralPrefs unit to use revised IPreference property name.
* Changed check box in display section of General tab of Preferences dialog box to refer to hiding empty "section headings" instead of categories.
* Updated General Preferences help topic re changes.
* Updated config file documentation.

XMLDoc commented unit.

Added support for displaying selected view items in new tab in detail pane when items are Ctrl clicked (or Ctrl right-clicked) in overview pane.

* Added extra NewTab parameter to INotifier.ShowViewItem and implemented it in TNotifier to set related action's NewTab property. This helps in passing along requests for displaying view items in new tabs via notifier.
* Made minimal changes to code that calls INotifier.ShowViewItem: all changes leave end result unchanged.

* Added new "NewTab" property to TViewItemAction.
* Changed TMainForm handling of view item actions to request new detail tab from main display manager when a view item action has NewTab property set to true.

* Changed tree view so no selection is made if Alt or Shift are pressed when mouse clicked.
* Menu pop-up is now handled manually and occurs only when Alt or Shift are not pressed.

* Changed key presses used to jump up and down sections in treeview to use Shift+Up instead of Ctrl+Up and Shift+Down instead of Ctrl+Down respectively.
* Shift+Up keypress now selects section head for a sub-item instead of previous section head.
* Renamed some private methods of TOverviewFrame.
* Updated help topic re changes.