AppImage release for GNU/Linux (x86-64) (Recent systems only)

PLEASE NOTE: This AppImage has been generated in Debian Testing, using a very recent version of both the glibc and Qt libraries. If you try to run this AppImage in older systems, chances are that it will fail to run. Ubuntu 16.04 LTS-compatible AppImage will arrive soon.

Features in this release:

• Improved GUI performance with throttled sources.
• Fully functional menu bar.
• Device dialog and refresh button (allows to detect new devices at runtime).
• Throttling performance indicator.
• Various GUI improvements.

Starting with this release, every new release will include two AppImage files:

• The "lite" AppImage: basic image linked against SoapySDR 0.5-2, does not include embedded SoapySDR modules (all modules are loaded from the local SoapySDR 0.5-2 install).
• The "full" AppImage: includes embedded support for AirSpy, soundcard, BladeRF, HackRF, Lime, RedPitaya and USRP.