Documentation in exaile for the file based compilation detection heuristic

[Eric Beuque]

In exaile preferences, we can see an option to enable/disable the file based compilation detection. The fact is that the user cannot understand how work this feature. When we expect that all files in a directory should be considered as Various Artist, and it doesn't, we are not able to understand why. What is the required file layout expected by Exaile?

You should first add documentation here https://blueprints.launchpad.net/exaile/+spec/compilation-support-for-exaile for the used heuristic and then add a help button which allow to get more explanation about this feature.