new feature 'vorbiscomment -e' to launch an editor
I often want to edit tags of ogg vorbis files using an editor, so I wrote a new option 'vorbiscomment -e' (similar to 'crontab -e').
I was a bit lazy, using the current directory for the temp file rather than getenv(TMPDIR), but I know some other apps do the same thing. Also, the patch is debian-specific as I use sensible-editor rather than getenv(VISUAL) etc.