[hpsdr] Mercury V2.1

[Phil Harman]

Many thanks to the Stage 1 Mercury V2 beta testers.

I've added Mercury V2.1 to the same SVN directory.  This version works in 
1Hz steps and has improved drive to the Atlas bus so hopefully will not be 
so position sensitive.

I've also incorporated some code review by Kirk, KD7IRS, that has fixed a 
few compiler warnings etc. Many thanks for your input Kirk.

Please load Mecury.pof as before and advise how this version performs.

73's Phil...VK6APH 


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