Add a test for missing files.
Make the logs optional.
Add TODO comments.
Log missing files.
Add one more TODO.
Merge pull request #1258 from ericsnowcurrently/backups-missing-logs

Make log files optional in a backup archive.

https://bugs.launchpad.net/juju-core/+bug/1398448

(Review request: http://reviews.vapour.ws/r/572/)
WIP action supercommand: registered with main
WIP action supercommand: removed wrong notes for defined
WIP CLI action supercommand: added common and common testing
WIP supercommand: add tabbedString method for outputs
TMP API: ActionUUIDs
TMP API: stub Actions(UUIDs) on action client
TMP API tweak to stub
WIP supercommand testing

Added stubbing features and Actions call.
WIP supercommand testing: tweaked package_test
TMP API Actions by UUID tweak: removed pointer type
WIP supercommand testing tweak: fix checkHelp
WIP supercommand testing
WIP supercommand testing
WIP supercommand testing move back to UUID method until jw4's stuff lands