* Add firmware for the YiXingDianZi MDSO (VID/PID: 1D50:608E).
* Sainsmart DDS120: Fix the 1kHz reference signal.
* Hantek 6022BL: Fix the voltage range selection (bug #1360).
* Allow LA captures at 48MHz samplerate (as long as bus conditions permit).
* Updated build requirement: sdcc >= 3.4.0 (bug #1326).
* Fix a build issue with sdcc >= 3.9.0 (bug #1404).
* Bump the firmware version (major.minor) to 1.4. This version is
backwards-compatible and doesn't require host-side (libsigrok) changes.
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