set release string in libhackrf and hackrf-tools even if they are built separately

Don't build hackrf_operacake utility.

added multisynth config to hackrf_debug example usage

change si5351c usage example to be the most common register that folks are likely to want to read

fixed long option usage examples

made part naming consistent in hackrf_debug

Merge pull request #336 from mossmann/sweep-csv

Merge pull request #335 from dominicgs/single_debug_tool

added one shot mode to hackrf_sweep

fixed bug that caused tuning glitches in interleaved sweep mode