CVS commit by raabe: 

- Support for running kwifi via a simple antenna. Refer to README.radio
  for detailed instructions, here's a rusty mini-guide:
  - Grab an old mouse and rip off the chord
  - Remove the (usually plastic) isolation from the chord
     - Optional: wrap the wire around an iron core for better quality
  - plug it into a serial port
  - change the PORT define in receiver.h to reflect which port you connected
    your antenna to
  - compile, run, play with the frequencies


  A            README.radio   1.1
  A            receiver.cpp   1.1
  A            receiver.h   1.1