Move param doc (#2843)

moved param doc from docs repo to here

param-docs/parameter-pages/PostProcessing/AllowNegativeRates.md

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+# Parameter `AllowNegativeRates`
+
+!!! Warning
+    This parameter is unused!
+    Use [`NUMBER.AllowNegativeRates`](../Parameters/#PostProcessing-NUMBER.AllowNegativeRates) instead!

param-docs/parameter-pages/PostProcessing/CheckDigitIncreaseConsistency.md

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+# Parameter `CheckDigitIncreaseConsistency`
+Default Value: `false`
+
+!!! Warning
+    This is an **Expert Parameter**! Only change it if you understand what it does!
+
+An additional consistency check.
+It especially improves the zero crossing check between digits.

param-docs/parameter-pages/PostProcessing/ErrorMessage.md

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+# Parameter `ErrorMessage`
+Default Value: `true`
+
+!!! Warning
+    This is an **Expert Parameter**! Only change it if you understand what it does!
+
+Do not show error message in return value.
+In an error case, the last valid number will be used for the various transmission protocols (MQTT, InfluxDB, REST, ...).

param-docs/parameter-pages/PostProcessing/NUMBER.AllowNegativeRates.md

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+# Parameter `<NUMBERS>.AllowNegativeRates`
+Default Value: `false`
+
+Allow a meter to count backwards (decreasing values).
+
+!!! Note
+    This is unusual (it means there is a negative rate) and not wanted in most cases!

param-docs/parameter-pages/PostProcessing/NUMBER.AnalogDigitalTransitionStart.md

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+# Parameter `<NUMBER>.AnalogDigitalTransitionStart`
+Default Value: `9.2`
+
+This can be used if you have wrong values, but the recognition of the individual ROIs are correct.
+Look for the start of changing of the first digit and note the analog pointer value behind.
+Set it here. Only used on combination of digits and analog pointers.
+See [here](../Watermeter-specific-analog---digital-transition) for details.
+
+Range: `6.0` .. `9.9`.

param-docs/parameter-pages/PostProcessing/NUMBER.DecimalShift.md

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+# Parameter `<NUMBER>.DecimalShift`
+Default Value: `0`
+
+Shift the decimal separator (positiv or negativ).
+Eg. to move from `m³` to `liter` (`1 m³` equals `1000 liters`), you need to set it to `+3`.

param-docs/parameter-pages/PostProcessing/NUMBER.ExtendedResolution.md

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+# Parameter `<NUMBER>.ExtendedResolution`
+Default Value: `false`
+
+Use the decimal place of the last analog counter for increased accuracy.
+
+!!! Note
+    This parameter is only supported on the `*-class*` and `*-const` models! See [Choosing-the-Model](../Choosing-the-Model) for details.

param-docs/parameter-pages/PostProcessing/NUMBER.IgnoreLeadingNaN.md

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+# Parameter `<NUMBER>.IgnoreLeadingNaN`
+Default Value: `true`
+
+Leading `N`'s will be deleted before further processing.
+This is only relevant for models which use `N`!
+See [here](../Choosing-the-Model) for details.

param-docs/parameter-pages/PostProcessing/NUMBER.MaxRateType.md

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+# Parameter `<NUMBER>.MaxRateType`
+Default Value: `AbsoluteChange`
+
+Defines if the **Change Rate** is calculated as the difference between the last two readings (`AbsoluteChange` = difference) or
+as the difference normalized to the interval (`RateChange` = difference per minute).

param-docs/parameter-pages/PostProcessing/NUMBER.MaxRateValue.md

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+# Parameter `<NUMBER>.MaxRateValue`
+Default Value: `0,05`
+
+Maximum allowed change between two readings, if exceeded the last reading will be rejected. Depending on the settings of `<NUMBER>.MaxRateType` the `MaxRateValue` is either treated as the difference between the two measurements (`AbsoluteChange` = difference) not taking the set time interval into account or as the difference normalized to the interval (`RateChange` = difference per minute).
+
+If negative rate is disallowed and no maximum rate value is set, one false high reading will lead to a period of missing measurements until the measurement reaches the previous false high reading. E.g. if the counter is at `600,00` and it's read incorrectly as` 610,00`, all measurements will be skipped until the counter reaches `610,00`. Setting the MaxRateValue to `0,05` leads to a rejection of all readings with a difference `> 0,05`, in this case `610,00`. The rejection also applies to correct readings with a difference `> 0,05`!

param-docs/parameter-pages/PostProcessing/PreValueAgeStartup.md

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+# Parameter `PreValueAgeStartup`
+Default Value: `720`
+
+!!! Warning
+    This is an **Expert Parameter**! Only change it if you understand what it does!
+
+Time in minutes, how long a previous read value is valid after reboot.

param-docs/parameter-pages/PostProcessing/PreValueUse.md

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+# Parameter `PreValueUse`
+Default Value: `true`
+
+Use the previous value (value from previous round) for consistency checks.
+This also works through a reboot of the device!