Set default diff type to 'lines', faster for starters.

backend/templates/diff.html

@@ -8,9 +8,9 @@
         <fieldset>
 
             <label for="diffWords" class="pure-checkbox">
-                <input type="radio" name="diff_type" id="diffWords" value="diffWords" checked=""/> Words</label>
+                <input type="radio" name="diff_type" id="diffWords" value="diffWords" /> Words</label>
             <label for="diffLines" class="pure-checkbox">
-                <input type="radio" name="diff_type" id="diffLines" value="diffLines"/> Lines</label>
+                <input type="radio" name="diff_type" id="diffLines" value="diffLines" checked=""/> Lines</label>
 
             <label for="diffChars" class="pure-checkbox">
                 <input type="radio" name="diff_type" id="diffChars" value="diffChars"/> Chars</label>