Filters refactoring

* splits filters.py of compensation and ema app into separate files in new /filters module
* optimizes entry search for multi keyword input

konova/filters/mixins/keyword.py

@@ -36,6 +36,9 @@ class KeywordTableFilterMixin(django_filters.FilterSet):
 
         """
         value = value.strip()
+        value = value.split(" ")
         # build filter expression
-        q = Q(title__icontains=value) | Q(identifier__icontains=value)
+        q = Q()
+        for val in value:
+            q &= Q(title__icontains=val) | Q(identifier__icontains=val)
         return queryset.filter(q)