[hpsdr] Dither and Random should be enabled for best performance of Mercury

[Ronald Cox]

All,
Phil Harman reminded me about Dither and Random last week, but I must  
confess I forgot about it this week until I started getting IMD  
Dynamic Range numbers that were about half of what I expected. As a  
result, I have added this to the section on Receiver Performance, IMD  
Dynamic Range on the Wiki:

Important note: To get good performance with respect to the IMD  
Dynamic Range tests, be sure to check "Dither Enabled" and "Random  
Enabled" in the PowerSDR >Setup > HPSDR > Mercury Options panel. If  
this is not done your IMD Dynamic Range will be reduced by about 50%.

Ron, W9KFB
Indianapolis
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