7.3.1

1. Added GLONASS correction support for RTCM1819 format.

2. Added error message box to ensure the user does not try to send a 
group configuration that has more than 20 log specs in it.

3. Modified RTCA corrections to send RTCAOBS and RTCAOBS2 messages when 
GLONASS corrections are requested for RTCA format.

