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Add audiotools 2.18.

Python Audio Tools are a collection of audio handling programs
which work from the command line. These include programs for CD
extraction, track conversion from one audio format to another,
track renaming and retagging, track identification, CD burning from
tracks, and more. Supports internationalized track filenames and
metadata using Unicode. Works with high-definition, multi-channel
audio as well as CD-quality. Track conversion uses multiple CPUs
or CPU cores if available to greatly speed the transcoding process.
Track metadata can be retrieved from FreeDB, MusicBrainz or compatible
servers.