message: Add hidden config options for forcing the download of graphene blocks
  and also add this for thinblocks which was missing since the time we
  moved to the new arg checking.
  connect-graphene-force and connect-thinblock-force were added.
diff: @@ -543,6 +543,10 @@ static void addDebuggingOptions(AllowedArgs &allowedArgs, HelpMessageMode mode)
  .addDebugArg("printpriority", optionalBool,
  strprintf("Log transaction priority and fee per kB when mining blocks (default: %u)",
  DEFAULT_PRINTPRIORITY))
  + .addDebugArg("connect-thinblock-force", optionalBool,
  + strprintf("Force download of thinblocks from connect-thinblock peers (default: %u)", false))
  + .addDebugArg("connect-graphene-force", optionalBool,
  + strprintf("Force download of graphene blocks from connect-graphene peers (default: %u)", false))
  #ifdef ENABLE_WALLET
  .addDebugArg("privdb", optionalBool,
  strprintf("Sets the DB_PRIVATE flag in the wallet db environment (default: %u)", DEFAULT_WALLET_PRIVDB))
  