replace "announced" column with "Last RX" column
remove service column
Merge branch 'master' into ticket648
rename "Space Available" column header to "Space"
replace "Since" column w/ "Status"; relative times
Merge branch 'ticket648' into truckee
Merge branch '1973-status-last-rx' into truckee

Conflicts:
	src/allmydata/storage_client.py
	src/allmydata/web/root.py