New option to print graph nodes with the list command.
CUG: recommend Rose under storage and discovery (etc.).
Merge pull request #506 from hjoliver/cug-rose-plug

CUG: recommend Rose under storage and discovery (etc.).
Default batch size 10, delay zero, for job, event, and poll/kill.
Merge pull request #508 from hjoliver/zero-batch-delays

Default batch size 10, delay zero, for job, event, and poll/kill.
Make cylc list range STOP optional.

Assume a single cycle if STOP is not given.
Merge pull request #505 from hjoliver/list-graph-node-labels

New option to print graph nodes with the list command.
Merge branch 'master' into tidy-task-incoming-message-code