Minor update to fix 2 issues and adding additional options

1. The database fails to upgrade if there are no studies, fixed.

Found on last update, update process failed to complete if there were no recorded studies on the device  

2. Bug fixes & reliability enhancements.

Relating to the lastest Android OS, V9

3. Options to clear all app data.

4. Security enhancements added to sending of study data via email & cloud.