RCG: irigb skew generates an error when it's below 2 usec
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For the status word, the new error level only applies to the LIGO PCIe timing card. Otherwise, the lower limit remains unchanged. But the displayed value only turns red below 2 no matter the timing, since MEDM is generated without knowledge of the timing system, and we favor O4 usage at the sites above backward correctness.
'IRIG-B' label on GDS-TP screen changed to 'TIME 0'