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

What's new in this version:
New functionality:
- Added choice of file size measure. You can choose between logical file size (the default), and physical file size.
- Added help. Hopefully rarely needed, but at least it exists.
Changes to the release files:
- The application has been released as a Universal Binary.
- The source release has been extended, and now includes everything needed to build the application. Newly included: (cleaned up) project file, help documentation, All Dutch resources (as an example for other localizers).
Tiny changes:
- Made titles of various panels and their default buttons more specific.
- Moved all localizable names into new Names.strings file.
- Moved all color palettes into "Palettes" subfolder.
- Enlarged bounding box of text fields where there was room (to facilitate localization).
Bug fixes:
- Enabling a filename or path test without specifying any strings does not give an error anymore.
- It was possible to specify a negative file size bound, which resulted in a very large size. Not any more.
- It was possible (to attempt) to save an image with a dimension that was zero or negative. This resulted in an exception. Not anymore.
- When a "void" test was returned after adding or editing a mask or filter rule an exception occurred. This has been fixed.
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