wee_database previously did daily summary backfills in one datbase
transaction. This resulted in errors for large archives being processed
on machines with relatively small amounts of memory. The TRANS-DAYS
command line parameter allows the backfill to be completed in a series
of database transactions using no more than TRANS-DAYS data at a time.
To provide a consistent approach to logging some minor changes were made
to the logging in DaySummaryManager.backfill_day_summary(),
DaySummaryManager.drop_daily() and StdArchive.setup_database().
Added --transfer option with mandatory --dest-binding parameter.
Included --dry-run parameter to do everything except the actual
transfer. Also reformatted usage display along functional lines as in
wee_extension.
