R1:bd7981c750ae

Improve the clarity of transactions that affect policies and spaces during object creation

Summary:
Ref T10004. Fixes T9527. Currently, we render two kinds of bad policy/space transactions during object creation.

First, we render a transaction showing a change from the default policy/space to the selected policy/space:

> alice shifted this object from space S1 Default to space S2 Secret.

This is a //good transaction// (it's showing that the default was changed, which could be important for policy stuff!