Store Item sorting

To enable items sold to the stores to be found with more ease how about these three minor(ish) changes ...

(1) Items return to the type of store from which they would have originally been sold (so pets go to the pet store etc)

(2) Piles get consolidated, so you only have one pile of any one item. This should reduce clutter.

(3) Enable item sorting (by either "level and type" or "type and item").

A