We want the outputs of CMEW to have consistent plot labels for all recipes (part 1 of user story #311).

This requires:

• Investigation of ESMValTool constraints and capabilities: Investigate the use of "alias" in ESMValTool recipes #288, Investigate whether arbitrary "dataset" identifiers work in ESMValTool #290
• Implementing a pipeline from CMEW to the recipe (Feed "label for plots" through as an "alias" in ESMValTool recipe #298) and from recipe to plots (Amend radiation budget recipe and diagnostic script on ESMValTool #302)
• Ensuring future CMEW recipes make use of the pipeline (Developer guidance: ensure all CMEW recipes make use of alias as plot labels #312)

(Note linked issue #312 to ensure that developer guidance ensures new CMEW recipes use alias.)