In my music library sometimes I have the same album in two formats. Then when I do an album search I get the same songs two times. Is there a feature to deal with this. If not, can somebody familiar with the codecase suggest where I should start to look to implement such a feature? According to about I'm running 1.1.9.2

Best

There is no feature to deal with that currently.
It's not that straightforward to add I think. Ignoring files that already have been added with a different extension shouldn't be too hard, but giving priority to one and dealing with songs already added with a lesser priority extension makes it a bit complicated.
The best place to discuss that would on the irc channel.