User context (session) is not fully preserved

1. Find contributions: amount > $50 (or another search which shows a small subset of contributions)
2. Edit a contribution
3. Click "Done"

You will be returned to the search page, but with no criteria. This is a major problem if the full search is an expensive screen (it costs us about 5 minutes of cpu time). The criteria and form key should have been restored from the session. This bug affects all forms.

There are also a lot of hardcoded redirect urls, and I think they are generally loaded using "replaceUserContext", so the previous session data will be lost.