
- count up "blocks" of WAV (rounding up for each file), and compare
  against "disk-info" block size report to make sure it'll fit on a disk
- use File::Spec/File::Basename
- handle arbitrary filename exts (especially now that we have ogg/flac support)
- tests for file and programs only if we expect to run a stage requiring them
- improve "System", and dump tool output on failures, etc
