AirSpy Firmware version v1.0.0-rc7

Modifications for rc7:

• Fix issue storing the build date inside firmware #13 thanks to martinzsmith for the fix
• Unified AirSpy firmware, support multiple AirSpy board type with same firmware
• Unified multiple configurations files to one configuration per board with multiple expansion points
• Add management of alternative configurations
• Add management of samplerate in KHz (in addition to index)

Note:
- This firmware support 10MSPS & experimental 2.5MSPS for AirSpy NOS R0/R2
- This firmware support 6MSPS & 3MSPS for AirSpy Mini

• MD5 for https://github.com/airspy/firmware/releases/tag/v1.0.0-rc7 (build on 2016-04-23):
  md5sum airspy_fw/airspy_rom_to_ram/airspy_rom_to_ram.bin
1a7ae43ce0bb713e20af89d7868990b4 airspy_fw/airspy_rom_to_ram/airspy_rom_to_ram.bin
airspy_fw/airspy_rom_to_ram/airspy_rom_to_ram.bin Size 19 548 bytes
• To flash the latest firmware in attachment airspy_fw_v1.0.0-rc7.zip
• For Windows:
  • 1. Extract the archive
  • 2. Connect AirSpy with USB to your computer
  • 3. Launch airspy_spiflash.bat from extracted archive directory
  • 4. Disconnect AirSpy from USB computer
  • 5. Connect AirSpy with USB to your computer, now you can use your favorite software

Note:
The new samplerate option in KHz is supported since v1.0.8 host tools & airspy library see
https://github.com/airspy/host/releases/tag/v1.0.8