Simplified the rewrite logic for the parent/child queries.
when thread pool queue size is negative use unbounded queue
Add /_cat/master.

% curl localhost:9200/_cat/master
id                     ip             node
Zdumn8bkTuOGRLfr9JL8jQ 192.168.20.109 Petros, Dominic
Use standard CSS inline separator.
Don't consider header width if not printed.
Add /_cat/nodes.