WIP: try to set relative offset correctly based on sources
stop absolutizing
update debug
add/fix debug
add more tests, after calculating expected values for this disc
make sources an object property
also add source for DATAFILE
move some assignments around to be more logical
use a common _index method for all cases
strokes test case is now correct
fix expectations on surfer rosa test

looks like it was interpreting relative on an index02 relative to the
track's index 00, instead of relative to the source
add note
now that we have a literal conversion of the toc, update

the toc doesn't notice the real pregap audio data, so marks the HTOA
as silence, and puts all following audio data in one file.

Update .cue file to reflect this; ie, create a cue file that misses the
HTOA