Working Tone Sweep

- Added "SendCmdReceiveAnswerFast" function which is a very fast way to
talk to the Si4060 (not recommended for init config)
- "delay(50); // Don't wait too long now..."  this delay tunes pulse
duration (clean this up later)
- "unsigned char size_0 = 0x0F;" this controls step size
- NOTE: config.h has been changed for arko's 26mhz hardware!