Fix the top seam and make the sides seamless.
simplified feed/tag selection, made tags selectable again

Simplified to the point where the feedlistctrl does almost all of its
own work.

I think the only reason to keep any of this logic in the feedservice is
so we can communicate with stuff like subscription or entries.
That should go through the feedservice.
moved feedlist to the right. Looks nice!
better feed indicator on entries
eliminate unneeded left padding on feedlist
better dynamic 20%/80% width. use min-max widths, rems for calc.
cleaning up edit mode