code2freq: separate BDS B1 and B1C which have different freq #513
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B1 and B1C have different frequencies, B1 1561.098 MHz, B1C/B1A 1575.42 MHz. The frequency indices are assumed to represent different frequencies (with the exception of GLONASS where there are frequency deltas per satellite for some signals) and these signals are not going to mix in RTK solutions.
B1 (2I) is most common and is kept at index 0. B1C (1P) is less common and is moved to index 4, bumping the rare 8P signal to index 5.