Update audio/freebox-title-fix

Escape slashes in the title tag so that they don't mess up with the sed
script.
Update audio/{sedaflac,vorbised}

Do the tags/comments replacement in two steps to catch sed errors before
setting the tags/comments back. Otherwise, the errors make the
replacement tags/comments empty, effectively removing all tags/comments
from the file.
Update misc/check-hardlinks

Janitor work to rename all uppercase varialbes into lowercase ones.
Add misc/awvol

A small script to get/set the volume from pactl/amixer, and report it
through awesome's naughty-fications.