Spare code in statusmap.c?

[Peter Westlake]

Some of the code for drawing the balanced tree status map is
conditional on this_host being NULL or not, and it always is.
There's a bit of code that used to set this_host depending on the
value of show_all_hosts, and that is commented out with a note not
to use it. I think most of the code between that and the call to
calculate_balanced_tree_coords can go.

Peter.



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