Shorten filenames in report

[andrewcbennett]

In the report produced by cleverdiff, shorten the filenames so that the smallest component that uniquely identifies each filename is shown.

For instance, when comparing identically-named files file.txt in the directories /var/tmp/foobar/oldfiles/ and /home/fred/foobar/, the report uses the labels /var/.../file.txt and /home/.../file.txt or something similarly unique and short to identify the old and new files, respectively.