Updated change log for 6.1.2.
cylc show: fix output ordering by sorting it
Merge pull request #1254 from benfitzpatrick/cylc-show.fix-output-ordering

cylc show: fix output ordering by sorting it
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.
Universal task state and name filtering for gcylc.

Via the shared updater rather than tree/list model filtering.
Improved dot updater task_list construction.