[hpsdr] Angelia_v5.4 and Orion_v4.3 firmware packages

[Joe Martin]

All, 

Angelia_v5.4 and Orion_v4.3 download packages are available at:

http://k5so.com/HPSDR_downloads.html

These versions shut down the Tx DAC when the TX INHIBIT feature is active.  The changes improve performance of the TX INHIBIT feature when the Angelia/Orion transceiver boards are used as stand alone boards without ANAN PA or Alex filter boards present.   

73, Joe K5SO