Parsing track lengths with data tracks in the next session

[MerlijnWajer]

Related to #170 . After hacking the musicbrainz code out, whipper will rip most of the tracks, but fail at one of the last audio tracks.

I -think- the CD layout is like this:

Session 1: 15 tracks
Session 2: 1 data track, 1 audio track

Ripping track 15 fails, with a 'FileSizeError', where whipper expected cdparanoia to read less/more than what cdparanoia actually managed to read.

I believe this is a bug in morituri's way of building a toc (likely related to data tracks being first).

I have a cue+bin copy of the CD and will upload it later.