Bump automatic replay protection to Nov 2020 upgrade

Summary:
This returns main chain to ForkID of 0 after the May 2020
upgrade, and implements automatic replay protection for
the Nov 2020 upgrade.

The next upgrade time is precisely 184.0 days after the
phonon activation time, and is:
  Sunday, November 15, 2020 12:00:00 PM   UTC

For reference see last HF: D3868

Depends on D5289

Test Plan: `ninja check-all` ; check timestamp carefully

Reviewers: #bitcoin_abc, deadalnix, Mengerian, markblundeberg

Reviewed By: #bitcoin_abc, deadalnix, Mengerian

Subscribers: Mengerian, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D5253

doc/release-notes.md

@@ -8,6 +8,7 @@ This release includes the following features and fixes:
   it returns the active commands and the corresponding execution time.
 - `ischange` field of boolean type that shows if an address was used for change
 output was added to `getaddressinfo` method response.
+- Bump automatic replay protection to Nov 2020 upgrade.
 
 
 New RPC methods

src/chainparams.cpp

@@ -174,6 +174,9 @@ class CMainParams : public CChainParams {
         // May 15, 2020 12:00:00 UTC protocol upgrade
         consensus.phononActivationTime = 1589544000;
 
+        // Nov 15, 2020 12:00:00 UTC protocol upgrade
+        consensus.axionActivationTime = 1605441600;
+
         /**
          * The message start string is designed to be unlikely to occur in
          * normal data. The characters are rarely used upper ASCII, not valid as
@@ -398,6 +401,9 @@ class CTestNetParams : public CChainParams {
         // May 15, 2020 12:00:00 UTC protocol upgrade
         consensus.phononActivationTime = 1589544000;
 
+        // Nov 15, 2020 12:00:00 UTC protocol upgrade
+        consensus.axionActivationTime = 1605441600;
+
         diskMagic[0] = 0x0b;
         diskMagic[1] = 0x11;
         diskMagic[2] = 0x09;
@@ -573,6 +579,9 @@ class CRegTestParams : public CChainParams {
         // May 15, 2020 12:00:00 UTC protocol upgrade
         consensus.phononActivationTime = 1589544000;
 
+        // Nov 15, 2020 12:00:00 UTC protocol upgrade
+        consensus.axionActivationTime = 1605441600;
+
         diskMagic[0] = 0xfa;
         diskMagic[1] = 0xbf;
         diskMagic[2] = 0xb5;

src/consensus/params.h

@@ -84,6 +84,8 @@ struct Params {
     int gravitonHeight;
     /** Unix time used for MTP activation of 15 May 2020 12:00:00 UTC upgrade */
     int phononActivationTime;
+    /** Unix time used for MTP activation of 15 Nov 2020 12:00:00 UTC upgrade */
+    int axionActivationTime;
 
     /**
      * Don't warn about unknown BIP 9 activations below this height.

src/validation.cpp

@@ -464,7 +464,7 @@ std::string FormatStateMessage(const CValidationState &state) {
 static bool IsReplayProtectionEnabled(const Consensus::Params &params,
                                       int64_t nMedianTimePast) {
     return nMedianTimePast >= gArgs.GetArg("-replayprotectionactivationtime",
-                                           params.phononActivationTime);
+                                           params.axionActivationTime);
 }
 
 static bool IsReplayProtectionEnabled(const Consensus::Params &params,