V2.7.2

- check in manual sync if background uploading is selected (can only
either)
- updated manifest for new Google Play Services (needs to be
installed!)
- improved SS sensor
- ensure that only one file is uploaded
to GDrive
V2.7.2 - sync again

- check in manual sync if background uploading is selected (can only
either)
- updated manifest for new Google Play Services (needs to be
installed!)
- improved SS sensor
- ensure that only one file is uploaded
to GDrive