Set -relaypriority default to false

This enables spending of individual coins during mining slow start.

Closes #904.

src/init.cpp

@@ -388,7 +388,7 @@ std::string HelpMessage(HelpMessageMode mode)
     if (showDebug)
     {
         strUsage += HelpMessageOpt("-limitfreerelay=<n>", strprintf("Continuously rate-limit free transactions to <n>*1000 bytes per minute (default: %u)", 15));
-        strUsage += HelpMessageOpt("-relaypriority", strprintf("Require high priority for relaying free or low-fee transactions (default: %u)", 1));
+        strUsage += HelpMessageOpt("-relaypriority", strprintf("Require high priority for relaying free or low-fee transactions (default: %u)", 0));
         strUsage += HelpMessageOpt("-maxsigcachesize=<n>", strprintf("Limit size of signature cache to <n> entries (default: %u)", 50000));
     }
     strUsage += HelpMessageOpt("-minrelaytxfee=<amt>", strprintf(_("Fees (in BTC/Kb) smaller than this are considered zero fee for relaying (default: %s)"), FormatMoney(::minRelayTxFee.GetFeePerK())));

src/main.cpp

@@ -1184,7 +1184,7 @@ bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransa
                              REJECT_INSUFFICIENTFEE, "insufficient fee");
 
         // Require that free transactions have sufficient priority to be mined in the next block.
-        if (GetBoolArg("-relaypriority", true) && nFees < ::minRelayTxFee.GetFee(nSize) && !AllowFree(view.GetPriority(tx, chainActive.Height() + 1))) {
+        if (GetBoolArg("-relaypriority", false) && nFees < ::minRelayTxFee.GetFee(nSize) && !AllowFree(view.GetPriority(tx, chainActive.Height() + 1))) {
             return state.DoS(0, false, REJECT_INSUFFICIENTFEE, "insufficient priority");
         }