Ordnet html-visning av hyller.

Denne trenger fiksing, gjerne med CSS-magi, men viser foreløpig hyller
med kategorier representert som html-tabeller.

python/web/library/models.py

@@ -230,6 +230,16 @@ class Placement(models.Model):
                         shelf_list[placement.get_column()][placement.get_row()].append(placement.category)
                 return shelf_list
 
+        @staticmethod
+        def shelf_as_list_row_then_col(shelfname):
+                placements = Placement.objects.filter(shelf__startswith=shelfname)
+                rows = max(map(lambda x: x.get_row(), placements))
+                columns = max(map(lambda x: x.get_column(), placements))
+                shelf_list = [ [[] for i in xrange(columns+1)] for j in xrange(rows+1)]
+                for placement in placements:
+                        shelf_list[placement.get_row()][placement.get_column()].append(placement.category)
+                return shelf_list
+
         @staticmethod
         def get_all_shelves():
                 shelves = set()