fix bug 21: copy and paste in IE 6

Author: mikesamuel

src/prettify.js

@@ -1289,7 +1289,7 @@ window['_pr_isIE6'] = function () {
               for (var j = lineBreaks.length; --j >= 0;) {
                 var lineBreak = lineBreaks[j];
                 lineBreak.parentNode.replaceChild(
-                    document.createTextNode('\r\n'), lineBreak);
+                    document.createTextNode('\r'), lineBreak);
               }
             }
           }

tests/prettify_test.html

@@ -25,7 +25,9 @@
 <script type="text/javascript">
 // get accurate timing
 PR_SHOULD_USE_CONTINUATION = false;
-_pr_isIE6 = function() { return false; };  // Ensure consistent output.
+if (!/[?&]testcopypaste\b/.test(location.search)) {
+  _pr_isIE6 = function() { return false; };  // Ensure consistent output.
+}
 </script>
 <link rel="stylesheet" type="text/css" href="../src/prettify.css" />
 <style type="text/css">