Merge pull request #5059

dbca89b Trigger -alertnotify if network is upgrading without you (Gavin Andresen)
e01a793 Refactor -alertnotify code (Gavin Andresen)

Signed-off-by: Gavin Andresen <gavinandresen@gmail.com>

src/miner.cpp

@@ -83,6 +83,11 @@ CBlockTemplate* CreateNewBlock(const CScript& scriptPubKeyIn)
         return NULL;
     CBlock *pblock = &pblocktemplate->block; // pointer for convenience
 
+    // -regtest only: allow overriding block.nVersion with
+    // -blockversion=N to test forking scenarios
+    if (Params().MineBlocksOnDemand())
+        pblock->nVersion = GetArg("-blockversion", pblock->nVersion);
+
     // Create coinbase tx
     CMutableTransaction txNew;
     txNew.vin.resize(1);