Have atom feed also work with threads
Have atom feed also work with threads

Atom feeds should also be able to show the progress of a single thread,
independent of which list it's currently on.

rbowen/ponymail,jimjag/ponymail,Humbedooh/ponymail,jimjag/ponymail,rbowen/ponymail,quenda/ponymail,Humbedooh/ponymail,jimjag/ponymail,Humbedooh/ponymail,quenda/ponymail,quenda/ponymail,jimjag/ponymail,rbowen/ponymail