fixes to contracts

contracts/A.sol

@@ -1,9 +1,9 @@
-pragma solidity ^0.4.11;
+pragma solidity ^0.5.8;
 
 contract A {
   uint256 a;
 
-  function A(uint256 _a) {
+  constructor(uint256 _a) public {
     a = _a;
   }
 }

contracts/AB.sol

@@ -1,12 +1,12 @@
-pragma solidity ^0.4.11;
+pragma solidity ^0.5.8;
 
 contract AB {
   uint256 a;
   int256 b;
 
   uint256 fund;
 
-  function AB(uint256 _a, int256 _b) public {
+  constructor(uint256 _a, int256 _b) public {
     a = _a;
     b = _b;
   }
@@ -15,7 +15,7 @@ contract AB {
     fund += msg.value;
   }
 
-  function getBurnedFund() public constant returns(uint256) {
+  function getBurnedFund() public view returns(uint256) {
     return fund;
   }
 
@@ -32,15 +32,15 @@ contract AB {
     b = _b;
   }
 
-  function getA() public constant returns(uint256) {
+  function getA() public view returns(uint256) {
     return a;
   }
 
-  function getB() public constant returns(int256) {
+  function getB() public view returns(int256) {
     return b;
   }
 
-  function getAB() public constant returns(uint256, int256) {
+  function getAB() public view returns(uint256, int256) {
     return (a, b);
   }
 }

contracts/ContractCreation.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.11;
+pragma solidity ^0.5.1;
 
 import "./Set.sol";
 
@@ -8,11 +8,11 @@ contract C1 {
   using Set for Set.Data; // this is the crucial change
   Set.Data knownValues;
 
-  function C1() {
+  constructor() {
     c2 = new C2();
   }
 
-  function register(uint value) {
+  function register(uint value) public {
     // Here, all variables of type Set.Data have
     // corresponding member functions.
     // The following function call is identical to

contracts/Logger.sol

@@ -1,8 +1,8 @@
-pragma solidity ^0.4.11;
+pragma solidity ^0.5.1;
 
 contract Logger {
   event EventLog(uint256 a, uint256 b);
-  function log(uint256 a, uint256 b) {
-    EventLog(a, b);
+  function log(uint256 a, uint256 b) public {
+    emit EventLog(a, b);
   }
 }

contracts/LoggerWithIndex.sol

@@ -1,8 +1,8 @@
-pragma solidity ^0.4.11;
+pragma solidity ^0.5.1;
 
 contract LoggerWithIndex {
   event EventLog(uint256 a, uint256 indexed b, uint256 c);
-  function log(uint256 a, uint256 b, uint256 c) {
-    EventLog(a, b, c);
+  function log(uint256 a, uint256 b, uint256 c) public {
+    emit EventLog(a, b, c);
   }
 }

contracts/QtumTest.sol

@@ -1,28 +1,28 @@
-pragma solidity ^0.4.0;
+pragma solidity ^0.5.1;
 
 contract QtumTest {
    uint storedNumber;
-   function QtumTest() {
-       storedNumber=1;
+   constructor() public {
+       storedNumber = 1;
    }
    function setNumber(uint number) public{
        storedNumber = number;
    }
-   function logNumber() constant public{
+   function logNumber() view public{
         log1("storedNumber", uintToBytes(storedNumber));
    }
-   function returnNumber() constant public returns (uint){
+   function returnNumber() view public returns (uint){
        return storedNumber;
    }
    function deposit() public payable{
    }
    function withdraw() public{
        if(!msg.sender.send(this.balance)){
-           throw;
+           revert();
        }
    }
    //utility function
-   function uintToBytes(uint v) constant returns (bytes32 ret) {
+   function uintToBytes(uint v) view public returns (bytes32 ret) {
        if (v == 0) {
            ret = '0';
        }

contracts/Set.sol

@@ -1,10 +1,10 @@
-pragma solidity ^0.4.11;
+pragma solidity ^0.5.1;
 
 // This is the same code as before, just without comments
 library Set {
   struct Data { mapping(uint => bool) flags; }
 
-  function insert(Data storage self, uint value)
+  function insert(Data storage self, uint value) public
       returns (bool)
   {
       if (self.flags[value])
@@ -13,7 +13,7 @@ library Set {
       return true;
   }
 
-  function remove(Data storage self, uint value)
+  function remove(Data storage self, uint value) public
       returns (bool)
   {
       if (!self.flags[value])
@@ -22,7 +22,7 @@ library Set {
       return true;
   }
 
-  function contains(Data storage self, uint value)
+  function contains(Data storage self, uint value) public view
       returns (bool)
   {
       return self.flags[value];