Implementation of a functionality to generate and export statistical reports

[evilaliv3]

This ticket is related to the analysis and integration of the feature report generation and export of statistical reports provided in #4314

The functionality is expected to:

• Enable administrators or analysts to define reports by adding statistical graphs to a report
• Enable analysts to export the resulting reports as defined

[evilaliv3]

Status of the current implementation:

• From the demo of the functionality the functionality seems functional but not complete as we have not seen the interfaces for configuring the type of reports or saving the configurations in order to be able to export reports in the same format after defining them. It seems as well not possible to export the report graphs (e.g. in PDF) except by printing the report.

Actions necessary to possibly integrate same functionality:

• Verify the implementation is complete
• Implement some client tests to guarantee appropriate code coverage.

Suggestion to simplify writing tests:

• It could be evaluated to just navigate the report generation page as analyst, configure a report and then exporting the resulting report.