Stake modifier work

Change MAKX_MONEY value from 21M to 10M.
Sync improvements for older clients.
TimeHash wrapper for stake modifier hash timestamps (fixes old uint256 sorting issue).
Some further work to stake modifier genetion (WIP)
Added some debug code for debugging stake modier generation
:q
q

src/amount.h

@@ -22,7 +22,7 @@ static const CAmount COIN = 100000000;
  * critical; in unusual circumstances like a(nother) overflow bug that allowed
  * for the creation of coins out of thin air modification could lead to a fork.
  * */
-static const CAmount MAX_MONEY = 21000000 * COIN;
+static const CAmount MAX_MONEY = 10000000 * COIN;
 inline bool MoneyRange(const CAmount& nValue) { return (nValue >= 0 && nValue <= MAX_MONEY); }
 
 #endif //  BITCOIN_AMOUNT_H

src/chain.h

@@ -69,6 +69,7 @@ class CBlockFileInfo
          nUndoSize = 0;
          nFlags = 0;
          nStakeModifier = 0;
+         nStakeModifierChecksum = 0;
          hashProofOfStake = arith_uint256();
          prevoutStake.SetNull();
          nStakeTime = 0;

src/init.cpp

@@ -59,7 +59,7 @@
 #include <util/threadnames.h>
 #include <util/translation.h>
 #include <validation.h>
-
+#include <pos.h>
 #include <validationinterface.h>
 #include <walletinitinterface.h>