Update time period entry in simulation mode documentation.
Merge pull request #1258 from arjclark/doc.corect_run_time_range

documentation: Update time period entry in simulation mode documentation.
Added an extra large dot size for gcylc.
Merge pull request #1263 from hjoliver/gcylc.extra-large-dots

Added an extra large dot size for gcylc.
cylc poll-all: add functionality to poll all