2.0.16

Issues

• issue #68: wrong total in outstanding items
• issue #69: pre-fill due date if an organization has been pre-selected
• issue #70: sequence numbers in show view incorrect
• issue #75: JavaScript bugs in ticket system
• issue #76: exclude persons from being synchronized
• issue #77: customer accounts with a document date on the 1st of a
  particular month are not visible in sales journal
• issue #78: ordering in sales journal incorrect
• some bug fixes in Google synchronization