[hpsdr] Orion_v2.8 firmware

[Joe Martin K5SO]

All, 

The Orion_v2.8 firmware package is available for download from:

http://k5so.com/HPSDR_downloads.html

This version of Orion firmware fixes an intermittent failure of the Alex/ANAN-PA-filter boards to respond reliably to switching commands via the SPI bus.  

In particular, this version fixes the sporadic failure of ANAN-200D to output power when PTT is pressed in SSB mode, among other intermittent relay switching issues when using Alex filters with barefoot Orion boards.  

73, Joe K5SO