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XMLDoc commented unit.

Added option to prevent close button from appearing in dialogue box title bar. Also disabled ESC from closing dialogue box. This option applies only to custom message boxes.

Changed spacing around text in custom sized message box buttons.

Removed old TODOs that refer to completed tasks.

Modified IQuery / TQuery to permit searches to be nested, so one acts on results of previous one.
Also added new IQuery.IsSearchActive method and its implementation.

Added new TCompoundSearch search that applies two searches consecutively. These searches can themselves be compounded to give chains of three or more searches.
Also added new factory method to create a TCompilerSearch instance for two given searches.

Noted changes since v4.0 alpha 2 (preview) release.

Converted static TDetailPageLoader class into normal class that gets instantiated in TDetailViewFrame. Modified TDetailViewFrame accordingly.

Added facility to preferences dialog box to notify caller if any changes were made that require main window UI to be re-displayed.
All preferences frames were modified to flag such changes.
Modified TDialogMgr manager to pass this extra info to main form.
Modified main form to refresh display if required.

Fixed bug where content of last open tab in detail pane was still being displayed when all tabs closed.
Fixes bug #3534138.