mate-disk-usage-analyzer: Switch to quantify file number instead of file size

[bash0]

feature request: It would be great if instead of showing the file size, the disk content could be alternatively quantified by file number count. Sometimes there are hundred thousands of files on a disk, and one would like to see, where the majority is located. This should be relatively easy to implement, because instead of summing up different file sizes, every file just adds a count of 1.

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