Merge pull request #1 from ckuethe/master

Big cleanups:
chris.kuethe@gmail.com did a bunch of tinkering with your port of kalibrate

- wrapped all the debug prints in "if (g_verbosity)" to not spam the terminal
- added a couple of new flags to control the various gains
- fixed the sampling rate: 1MHz is below the 8MHz minimum sample rate
- fixed the decimation

this now runs as fast as kalibrate-rtl
Update README

Thanks to chris.kuethe@gmail.com who did a bunch of tinkering with this port of kalibrate.