Change the usage functions to allow getting current/week/month usage for either a user or a project. Add a Ranking function, to get the ranking for the user or porject, over the last 30 days, by pnode hours.
Change the usage functions to allow getting current/week/month usage for
either a user or a project. Add a Ranking function, to get the ranking for
the user or porject, over the last 30 days, by pnode hours.

nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome