A small utility app that graphically shows the disk usage within a file system

What's new in this version:
New functionality:
- There is now a "rescan" command which generates an up-to-date window given an existing one. You can use this command after you have moved or deleted several files and folders.
Tiny changes:
- Window titles now include the time of the scan and, if needed, an additional number, to make each title unique.
- The scan progress panel now shows the name of the folder that is being scanned.
- Renamed the "Open" button of the directory view window to "Show".
- Renamed the "Scan directory..." command to "Scan Folder...".
Code clean up:
- Generalised the execution of background threads in the new AsynchronousTaskManager class, which is now used for both drawing and rescanning in a background thread.
- The scan progress panel has been moved into a nib of its own,
and now has a dedicated control: ScanProgressPanelControl.
Bug fix:
- Fixed the drawing code so that it also runs properly when compiled for Intel Macs. Many thanks to Craig Hughes for his help with this.
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