hourly.pl:
Allow for specifying which project to run, and running multiple projects at once.

Switch to getting the full list of logs on master, and add support for finding
logs to load only into logdb.

integrate.sql:

Is it faster to aggregate today's emails before looking them up in
stats_participant, or should we just use a left join?

Put a lock around grabbing participant ID's and assigning new ones so that
multiple projects can run at the same time

Put a lock around inserting into stats_os and stats_cpu.
