Adds code for RTCM in GLONASS processing. The commit includes legacy
messages (MS1009-MS1012) and integrated messages for GNSS fields.
A couple of bug fixes are included and addition of ephemeris fields
is completed.
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Now the Galileo E1 receiver generates RTCM messages 1045 (ephemeris) and
MSM7 / 1097 (observables). Parameters related to RTCM included in conf
files. The TCP/IP server can be activated by setting flag_rtcm_server to
true.