added new supporting content keys.  nodespace lists now show only the row for the selected nodespace when one is selected (as well as a link to go back to the full list).  css fixes for tab_side_container.html to unbreak nested tab containers.  metaspace user list now does the same row selection thing as nodespace list.  added metaspace admin view for nodespaces (only functionality wired up to that so far is nodespace info edit).  added (as-yet unimplemented) state for viewing users in metaspace admin.  refactored nodespace list controllers to cut down on repetition.  refactored and functionally tweaked JSON output generation in tripel_web so that dates and privilege sets are handled more gracefully.