Fix runtime namespace graphing.
Tidied graph viewer window titles.
Added a new test for namespacing graphing.
Removed a comment.
Removed the old checkvars utility from the CLI.
Merge pull request #1162 from hjoliver/1160.remove-checkvars-util

Removed the old checkvars utility from the CLI.
Merge pull request #1161 from hjoliver/bug-fix.namespace-graphing

Fix namespace graphing
Support list of suite to job environment variables

Globally configured list of environment variables that can be passed
from a suite to its jobs.