Multiple works by different composers merged

[classical11]

Hi Simon,

I have 2 different works that have the same name (i.e. same Group tag) and same Artist on the same album. However they are by 2 different composers.

MinimServer assumes that these 2 works are the same, presumably because they have the same Group and Artist and because they happen to be in a sequence. The 2 works appear merged into one.

MinimServer should also take the composer into account when parsing groups.