more refinements of the sidebar.
Added "Goto Target Set Button" on the library options side pane.
cleanup of the sidepanes of the library options, problem set list, user list.
Revert "Added "Goto Target Set Button" on the library options side pane."

This reverts commit 1fb814feb35fffe6bf8feae29d99a3a3e30ae281.
cleanup of the sidepanes of the library options, problem set list, user list.
Fixed some errors with message templating.
Added logout functionality
Added stop acting as user functionality.
More cleanup of messaging in Library Browser.