Artist name sorting

Currently artist names get no special consideration beyond "The " being ignored at the beginning of the name. IMHO this should be expanded to include "A ", but I'm filing this issue to get a bit more than that. If album artist tags are fixed https://github.com/andrewrk/groovebasin/issues/225 they can be abused for this purpose, and real tagging https://github.com/andrewrk/groovebasin/issues/207 could be used to manage the same thing.

All this boils down to having more control of the library pane. Why is Various Artists at the top and not sorted in? What do I need to do to get Tori Amos sorted as Amos, Tori? Even better I'd like it sorted as Amos, Tori but still displayed as Tori Amos, same as The Crystal Method is sorted under C...

So with full tagging you could end up with fileUnder, sortAs, and various displayNNN tags (where NNN is Artist/Album/...) Maybe that's a little over the top, but I think the point was to allow music to be a personal experience ;)