Add support for new grouping algorithms by Philippe Louchtch

• Completely overhaul groups overview page with useful information, settings and fixes
• Reuse group imports page for showing an overview of the import
• Reuse statistics and graphs from Philippe through Java
• Create temporary storage in the database
  • Used in this case for storing group matching output temporarily, but versatile and can be used for more.

Requires lib/java_grouping.jar built from https://gitlab.ewi.tudelft.nl/eip/bepsys/aidm-optimal-groups as well as Gurobi + license in order to function. This makes it hard to test. For now, only manual testing of this component is done.