Now updates all of the flags for loans at once.

- Added TestDate so that we can communicate with the TestDate table.
  It's really messy, but clarity isn't needed at this point, for this
  class.
- Added a function in the database.Loan file so that it tests all of
  dates against the system date. If the system date is later than the
  due date for the latest payment, then the system flags the loan. This
  will be needed when adding them to a notice document.
- This is in preparation for our notice document.
Merge cleanup when working with the Loan.java file.

Merge branch 'master' of https://github.com/Team-MWSU/GroupProject