readerp: support IGS UT1-TAI offsets #578
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The UT1-TAI offset is included in the IGS format, and products using this offset are being produced. Canonicalised these offsets to UT1-UTC for consistent internal use. Also detect the IGS format as having 'VERSION 2' in the first line, and distinguish between header and data lines, and support concatenated files that include the version and header lines.
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Noted GFZ ERP files use UT1-TAI and were not read correctly.
The UT1-TAI offset is included in the IGS format, and products using this offset are being produced. Canonicalised these offsets to UT1-UTC for consistent internal use.
Also detect the IGS format as having 'VERSION 2' in the first line, and distinguish between header and data lines, and support concatenated files that include the version and header lines.