Add support for EAC's non-compliant cue sheets

[GoogleCodeExporter]

Exact Audio Copy has an option to product non-compliant cue sheets
(http://wiki.hydrogenaudio.org/index.php?title=EAC_CUE_Sheets). It would be
useful if cuelib supported these.

The impact for this change would be relatively high, as the current cue
sheet data structure cannot model such a non-compliant sheet. This issue
will need further investigation.

Original issue reported on code.google.com by monsterm...@gmail.com on 22 May 2008 at 7:12