Fix CSRF issues in svx form

Set date formats
Add DataIssue model and add errors to it to allow us to give people a list of
stuff to fix

templates/svxfile.html

@@ -46,7 +46,7 @@ $(document).ready(function()
 </p>
 {% endif %}
 
-<form id="codewikiform" action="" method="POST">
+<form id="codewikiform" action="" method="POST">{% csrf_token %}
     <div class="codeframebit">{{form.code}}</div>
     <div style="display:none">{{form.filename}} {{form.dirname}} {{form.datetime}} {{form.outputtype}}</div>
     <input type="submit" name="diff" value="Diffy" />