added "log2" function selector to monadic reporter, tweaked "log"

snap.html

@@ -6,7 +6,7 @@
         <link rel="shortcut icon" href="src/favicon.ico">
         <script type="text/javascript" src="src/morphic.js?version=2019-02-07"></script>
         <script type="text/javascript" src="src/widgets.js?version=2018-10-02"></script>
-        <script type="text/javascript" src="src/blocks.js?version=2019-03-31"></script>
+        <script type="text/javascript" src="src/blocks.js?version=2019-04-02"></script>
         <script type="text/javascript" src="src/threads.js?version=2019-04-02"></script>
         <script type="text/javascript" src="src/objects.js?version=2019-04-02"></script>
         <script type="text/javascript" src="src/gui.js?version=2019-03-25"></script>

src/blocks.js

@@ -148,7 +148,7 @@ CustomCommandBlockMorph, SymbolMorph, ToggleButtonMorph, DialMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.blocks = '2019-March-31';
+modules.blocks = '2019-April-02';
 
 var SyntaxElementMorph;
 var BlockMorph;
@@ -1294,6 +1294,7 @@ SyntaxElementMorph.prototype.labelPart = function (spec) {
                     atan : ['atan'],
                     ln : ['ln'],
                     log : ['log'],
+                    log2 : ['log2'],
                     'e^' : ['e^'],
                     '10^' : ['10^']
                 },

src/threads.js

@@ -2723,7 +2723,10 @@ Process.prototype.reportMonadic = function (fname, n) {
         result = Math.log(x);
         break;
     case 'log': // base 10
-        result =  Math.log(x) / Math.LN10;
+        result =  Math.log10(x);
+        break;
+    case 'log2': // base 2
+        result =  Math.log2(x);
         break;
     case 'e^':
         result = Math.exp(x);