Various issues in Rinex clock file header parsing for mixed systems
Clock file JAX0MGXFIN_20202430000_01D_30S_CLK.CLK.gz has mixed content (satellite system set to 'M' in the first header line. This triggers several errors when attempting to parse the header:
- an exception is thrown when attemptinf to set up a first version of time scale while parsing line 1 (despite it will be overridden later when "TIME SYSTEM ID" will be parsed)
- line "SYS / DCBS APPLIED" as no satellite system, as no corrections are applied, this triggers another exception
- line "SYS / PCVS APPLIED" as no satellite system, as no corrections are applied, this triggers another exception