Add RELEASE NOTES for 1.6.7.1
Issue #439 - backward compatibility when duration is in numeric cell
Issue #439 - fix duration format in resetURLstring
Issue #441 - increase default placemark page size to 2000
Merge branch 'master' into develop
Merge branch 'develop' into feature/231-229
Issue #231 - hide statistics and country selector using flag

* These functionalities (developed in issue #231 and #229) are used by one 
partner, but are not fully integrated in the Dashboard. Based on the setting
of the showStatisticsFeature flag in the appengine-web.xml, these functionalities
are shown on the dashboard.