euscanwww: Watched herds/maintainers/categories panel

* Refactored templates and templatetags
* Added unfavourite views
* Added button to favourite/unfavourite package
* Panel for showing favourited objects

Signed-off-by: volpino <fox91@anche.no>

euscanwww/djeuscan/templates/euscan/herd.html

@@ -1,6 +1,6 @@
 {% extends "euscan/_datatable.html" %}
 
-{% load packages %}
+{% load euscan %}
 {% load url from future %}
 
 {% block title %}