Add MaxMagnitudeUnit to chain parameters

This establishes an upper clamp on the magnitude unit. Currently set at 5.

src/chainparams.cpp

@@ -77,6 +77,7 @@ class CMainParams : public CChainParams {
         consensus.MRCZeroPaymentInterval = 14 * 24 * 60 * 60;
         consensus.MaxMandatorySideStakeTotalAlloc = Fraction(1, 4);
         consensus.DefaultMagnitudeUnit = Fraction(1, 4);
+        consensus.MaxMagnitudeUnit = Fraction(5, 1);
         consensus.DefaultMagnitudeWeightFactor = Fraction(100, 567);
         consensus.StandardContractReplayLookback = 180 * 24 * 60 * 60;
         consensus.powLimit = uint256S("00000fffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
@@ -192,6 +193,7 @@ class CTestNetParams : public CChainParams {
         consensus.MRCZeroPaymentInterval = 10 * 60;
         consensus.MaxMandatorySideStakeTotalAlloc = Fraction(1, 4);
         consensus.DefaultMagnitudeUnit = Fraction(1, 4);
+        consensus.MaxMagnitudeUnit = Fraction(5, 1);
         consensus.DefaultMagnitudeWeightFactor = Fraction(100, 567);
         consensus.StandardContractReplayLookback = 180 * 24 * 60 * 60;
         consensus.powLimit = uint256S("0000ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");

src/consensus/params.h

@@ -41,6 +41,9 @@ struct Params {
     int ProjectV2Height;
     /**
       * @brief The default GRC paid for a constant block reward.
+      *
+      * Note that the GRC paid for CBR can be specified by an administrative protocol entry with the key name "blockreward1" for
+      * V13+ blocks. The value is specified in HALFORDS.
       */
     int64_t DefaultConstantBlockReward;
     /**
@@ -67,11 +70,21 @@ struct Params {
     Fraction MaxMandatorySideStakeTotalAlloc;
     /**
       * @brief The multiplier applied to network magnitude to determine the rate of accrual. Nominally 1/4 from Fern onwards.
+      *
+      * Note that the magnitude unit can be set by an administrative protocol entry with the key name "magnitudeunit" for
+      * V13+ blocks. The value is specified as a whole number or fraction. For example, 0.25 would be "1/4", 5 would be "5".
       */
     Fraction DefaultMagnitudeUnit;
+    /**
+      * @brief The maximum magnitude unit allowed to be specified. This is an upper clamp that is set at 5.
+      */
+    Fraction MaxMagnitudeUnit;
     /**
       * @brief The multiplier applied to (money supply / network magnitude) to scale the network magnitude into equivalent GRC
       * for purposes of computing voting weight. Nominally 1 / 5.67 from Fern onwards.
+      *
+      * The magnitude weight factor can be set by an administrative protocol entry with the key name "magnitudeweightfactor" for
+     * V13+ blocks. The value is specified as a whole number or fraction. For example, 1 / 5.67 would be "100/567", 2 would be "2".
       */
     Fraction DefaultMagnitudeWeightFactor;
     /** The "standard" contract replay lookback for those contract types that do not have a registry db.