+Cross-test versions
+ Part of the regression suite should be making sure that we don't
+ break backwards compatibility: old clients vs new servers and so
+ on. Ideally we would test the cross product of versions.
+
+ It might be sufficient to test downloads from well-known public
+ rsync servers running different versions of rsync. This will give
+ some testing and also be the most common case for having different
+ versions and not being able to upgrade.
+
+--no-blocking-io might be broken
+
+ in the same way as --no-whole-file; somebody needs to check.
+
+Do not rely on having a group called "nobody"
+
+ http://www.linuxbase.org/spec/refspecs/LSB_1.1.0/gLSB/usernames.html
+
+ On Debian it's "nogroup"