Extend carry,wave scripts to support polyserver deployment.

In order to add support for deployment to multiple nodes in a cluster,
extend carry,wave scripts to support SSH hosts defined as either

    tunefl@example.com

or

    "(tunefl@example.com tunefl@example.org)"

Now a cake can be carried to multiple bakesales. Hurrah for cake-cloning.
Alter rsync_ssh carry parameters, to expect separate directory.

Instead of passing the SSH parameter as

    tunefl@example.com:tunefl/

alter to pass as two parameters

    tunefl@example.com tunefl/

This requires less repetition with polyserver deployments.
Document new examples for monoserver and polyserver deployments.

This includes the `rsync_ssh` parameter change.
Merge branch 'polyserver' into develop
Tweak whitespace.