buzzdetect gains mp3 processing capability; a pre-release

buzzdetect is new! It's improved! It's mostly untested! But command-line access to the analyze function is operational, so that seems worthy of a prerelease.

New features

• Can analyze mp3 files of any length by chunking into temporary wav files that are deleted after analysis (chunk length specifiable as a number of hours by the --chunkLength option)
• Clones directory structure from input directory to output directory
• That's about it, but it took a dickens of a time to get there.