anchor.diff:  
   Here are relationship between observation periods and fields appropriately:
   
  -- **PT0S** - airTemperatureInCelsius, airTemperatureInFahrenheit, feelsLikeTemperatureInCelsius, feelsLikeTemperatureInFahrenheit, airPressureInHpa,
  +- **PT0S** - airTemperatureInCelsius, airTemperatureInFahrenheit, feelsLikeTemperatureInCelsius, feelsLikeTemperatureInFahrenheit, airPressureInHectoPascal,
                windSpeedInMeterPerSecond, windSpeedInKilometerPerHour, windSpeedInMilePerHour, windSpeedInBeaufort, windSpeedInKnot, windDirectionInDegree,
                dewPointTemperatureInCelsius, dewPointTemperatureInFahrenheit, relativeHumidityInPercent100based, effectiveCloudCoverInOcta, visibilityInMeter,
                visibilityInKilometers, visibilityInNauticalMile, visibilityInStatuteMile, presentWeather, weatherSymbol
  
positive.code: [/search?stationIds={stationIds}&fields={fields}&observedFrom={observedFrom}&observedUntil={observedUntil}&observedPeriod={observedPeriod}]
  
  #### Example
  `https://point-observation.weather.mg/search?stationIds=3007237,3007300&fields=meteoGroupStationId,meteoGroupStationName,stationLocation,stationTimeZoneName,airTemperatureInCelsius,airTemperatureInFahrenheit,feelsLikeTemperatureInCelsius,feelsLikeTemperatureInFahrenheit,airPressureInHpa,windSpeedInMeterPerSecond,windSpeedInKilometerPerHour,windSpeedInMilePerHour,windSpeedInBeaufort,windSpeedInKnot,windDirectionInDegree,dewPointTemperatureInCelsius,dewPointTemperatureInFahrenheit,relativeHumidityInPercent100based,effectiveCloudCoverInOcta,visibilityInMeter,visibilityInKilometers,visibilityInNauticalMile,visibilityInStatuteMile,presentWeather,weatherSymbol,windGustInMeterPerSecond,windGustInKilometerPerHour,windGustInMilePerHour,windGustInBeaufort,windGustInKnot,precipitationAmountInMillimeter,precipitationAmountInInch,pressureTendencyCode,pressureChangeInHectoPascal,temperatureMaxInDegreeCelsius,temperatureMaxInFahrenheit,temperatureMinInDegreeCelsius,temperatureMinInFahrenheit,precipitationAmountInMillimeter,precipitationAmountInInch,sunshineDurationInHours&observedPeriod=PT0S,PT1H,PT3H,PT12H,PT24H&observedFrom=2016-10-15T08:00:00Z&observedUntil=2016-10-15T10:00:00Z`
  
  + Response 200 (application/json)
  
  
negative.code:                 "observedPeriod": "PT0S",
                  "feelsLikeTemperatureInCelsius": 3.9,
                  "meteoGroupStationName": "Pleucadeuc",
                  "airPressureInHectoPascal": 1005.5,
                  "stationTimeZoneName": "Europe/Prague",
                  "effectiveCloudCoverInOcta": 5,
                  "observedUntil": "2016-10-15T08:00:00Z",
  