[MSNoise] bug in s06compute_dtt.py

In s06compute_dtt.py, when updated_days_for_dates is called with pair as "%", it doesn't work in database_tools.py. There is no query result back when calling days = session.query(Job).filter(Job.pair == pair).filter(Job.day >= date1).filter(Job.day <= date2).filter(Job.type == type).filter(Job.lastmod >= lastmod).group_by(Job.day).order_by(Job.day).all(). It probably work under windows, but it doesn't work in Linux. Xiao