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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.

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.
Off by one issue with L1S and L1L, was including L1E and missing L1S,
and the respective mask bits were off.
Adds a freq 6 option, and moves BDS B2ab to freq 6 and
moves BDS B1C and B1A to freq 5.
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