* Tech 400: JSON persistence layer implemented; old History class phased out.
2.58.2
* Tech. 399: Images of charts are moved to a separate folder.
2.58.1
* Bug 363: Pipeline name added to the job name in the list of the CI jobs.
2.58.0
* Feature 393: Option added to the report generator to generate just data files (json) and to omit frontend.
2.57.2
* Bug fix: More consistent use of logging levels: CRITICAL if the report can't be created, ERROR if data retrieved from a metric source can't be parsed, WARNING if a metric source can't be reached, and INFO for progress.