func: functions to manually end round sales
      
      uint256 public currentRound = 1;
      bool public icoPvtEnded = false;
       bool public icoPreEnded = false;
        bool public ico1Ended = false;
         bool public ico2Ended = false;
          bool public ico3Ended = false;
      
      function endPvtSale() onlyOwner public       
      {
          require(!icoPvtEnded);
          pvtTokens = tokensIssuedTillNow;
          currentRound = 2;
          updateRateInWei();
          icoPvtEnded = true;
          
      }