tools: calculate the multisynth output and print it
firmware: enable int mode if div is even integer

to improve jitter performance
fix indent, fix unused vars
firmware: New fractional sample rate algorithm and usb command

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
libhackrf: Update the library with new fractional sample rate API

And send the new USB command

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>