{set|get}ClkOffset in RinexObservationHeader is confusing
The name of the methods as well as its javadoc seem to imply the value is an offset (despite it is an integer), but it really is a flag corresponding to entry "RCV CLOCK OFFS APPL" in Rinex header.
So the names should read {set|get}ClockOffsetApplied
and the type should be a boolean.