please test latest master

[Dirk Hohndel]

Quite a few interesting PRs were merged today.
Changes to BLE timeout handling, Bluetooth names, data field initialization for NDL (better distinction between a true value of '0' and a value of '-1' (for don't know).

Also, better icon size for the profile on Subsurface-mobile.

Travis will give us an AppImage and Windows installer (now with debugging information - thanks Lubomir).
I'll try to get a Mac installer and an Android APK up as well - those will still be in downloads/test

Thanks

/D