Allow the cat-log command to print remote logs.

Addresses #709
cylc/cylc#766: implement job filtering
cylc/cylc#766: improve style
Merge branch 'master' into 766.job-submit-stderr-filtering
A final tidy of the new CUG sections.
cylc/cylc#766: implement feedback
Merge branch 'master' into 766.job-submit-stderr-filtering
Merge pull request #819 from hjoliver/minor-cug-changes

A final tidy of the new CUG sections.
cylc/cylc#766: remove redundant line
Merge pull request #815 from benfitzpatrick/766.job-submit-stderr-filtering

#766: filter some expected job submission stderr
cat-log: fix for remote jobs
cylc cat-log: add test battery
Merge pull request #804 from hjoliver/709.cat-remote-logs

Allow the cat-log command to print remote logs.
Merge branch '709.cat-remote-logs'
Updated the change log for 5.4.5.
Updated the cylc-wrapper documentation.