Release tests for unused variables

Changes for 2.001001 - 2023-05-17T02:46:03Z

• no longer run the test in tests, removing the need for Test::Vars to be installed until the generated distribution is tested

Utilities related to ImageMagick

Changes for 0.020 - 2023-03-01

• Add utilities convert-image-to-jpg (img2jpg, png2jpg), convert-image-to-png (img2png, jpg2png).
• Add --quality (-q) option to the convert-* utilities.

Play the tabla!

Changes for 0.0103 - 2023-05-16T16:10:45Z

• Add the eg/play-all program.

Play the tabla!

Changes for 0.0102 - 2023-05-16T14:05:28Z

• Improve documentation.
• Clean-up code a bit.