issue2550855: added search perms for anonymous to the user class. This lets the "show unassigned" search work for anonymous. Patch by Stuart McGraw. Added warning to upgrading.txt and a comment block before the schema change in every template tracker except minimal (doesn't have the search).

#!/usr/bin/env python
import zlib, base64, sys
print base64.encodestring(zlib.compress(sys.stdin.read()))