Improve form support for view supplements

this seems a bit hacky yet but works for now..

cf. field logic for Vendor -> Quickbooks Bank Accounts, which requires this

tailbone/templates/master/form.mako

@@ -3,8 +3,14 @@
 
 <%def name="modify_this_page_vars()">
   ${parent.modify_this_page_vars()}
-  % if master.deletable and instance_deletable and request.has_perm('{}.delete'.format(permission_prefix)) and master.delete_confirm == 'simple':
-      <script type="text/javascript">
+  <script type="text/javascript">
+
+    ## declare extra data needed by form
+    % for key, value in form.json_data.items():
+        ${form.component_studly}Data.${key} = ${json.dumps(value)|n}
+    % endfor
+
+    % if master.deletable and instance_deletable and master.has_perm('delete') and master.delete_confirm == 'simple':
 
         ThisPage.methods.deleteObject = function() {
             if (confirm("Are you sure you wish to delete this ${model_title}?")) {
@@ -12,8 +18,11 @@
             }
         }
 
-      </script>
-  % endif
+    % endif
+  </script>
+
+  ${form.render_included_templates()}
+
 </%def>