Updated Distance and Waveform programs
Now use new data format from MicroBlaze, fixes bugs
Updated sensor board resistor value in Eagle files
Changed USB UART speed to 57600bps
Updated 'pulsegen' FPGA core
Added parameter for pulse frequency
Made 'map' and 'par' synthesis steps use 2 threads
Added Ultrasound Receiver FPGA core
(Also includes other MHS changes)
Updated MicroBlaze code to use 'us_receiver' core
Includes changes to other areas of MicroBlaze code