[hpsdr] Diversity mode: use of LVDS-Pins of the TAPR-Mercury

[Joe Martin K5SO]

(I used the wrong subject header in my previous message so this a re- 
post to keep the archive thread consistent.)

Thanks Alfred,  for that!

I've already posted an updated (equivalently modified) version of  
Mercury v6.7.rbf, Quartus II archive file, and USBBlaster-Binaries to  
my website so that there is an option to use LVDS between the Mercs if  
you wish to share the 122.88 MHz clock  that way.

Alfred's observation that when using LVDS to distribute the 122.88MHz  
clock the second Merc doesn't start until the first is running is a  
potentially important one as this method of sharing the 122.88MHz  
clock has the possibility of stabilizing the relative phase between  
the multiple Mercs on start up (or not, hihi).  I will be checking  
that with my fingers crossed!

73,  Joe K5SO

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