Added column for incomplete sessions
Session started/stopped events now contain the session
Made session id volatile (to ease up sharing updates from background thread)
Current value should be displayed if current session is being recorded OR is not saved
Made buttons reflect state of app
Added sessionId to starting contribute activity
Save lost session activity
Updated About (fixes #878163)
Fixed CSV file writing
Throw correct exception
Removed useless code
Changed file naming scheme when sharing sessions.
tests work