Remove a debugging print statement left from the previous commit
Add credential storage and a way to pass the PHPReport login name
Add very rough support for a report spanning multiple weeks
Add a separate class for a week of work

This is the first step toward splitting the period of time off from the
report type.
The year is now optionally embedded in the week string
Have the reports take time periods

This allows for more general detailed and aggregate reports, which can
be used to make monthly reports in the future.
Fix Twiki uploads

They were broken by recent changes.
Split the formatter off from the reports

This will allow sharing formatters between the detailed and aggregate
report types.
Have the aggregate report use the formatter classes
Capitalize output for weeks
Allow generating tables without headers
Make aggregate twiki reports links to the detailed ones
Make columns easier to read for the twiki formatter