OMG a ridiculous commit to overhaul import handler config etc.

- add `MasterView.configurable` concept, `/configure.mako` template
- add new master view for DataSync Threads (needs content)
- tweak view config for DataSync Changes accordingly
- update the Configure DataSync page per `configurable` concept
- add new Configure Import/Export page, per `configurable`
- add basic views for Raw Permissions

tailbone/templates/master/index.mako

@@ -162,6 +162,9 @@
           <li>${h.link_to("Create a new {}".format(model_title), url('{}.create'.format(route_prefix)))}</li>
       % endif
   % endif
+  % if master.configurable and master.has_perm('configure'):
+      <li>${h.link_to("Configure {}".format(config_title), url('{}.configure'.format(route_prefix)))}</li>
+  % endif
 </%def>
 
 <%def name="grid_tools()">