Map tank list from object to list

This makes it possible for the filter to filter on most of the
data in the tanks (e.g. the values of polices) rather than just
the names. The filter implementation works with lists only.
Fix cancelling edits

Without this change the cancel removed the view onto the data.
Add meta files for recent additions.
Add link to and content for policymgr help

This is rather limited at this point, but I'd rather
hear more about what people need to know.