v1.16.0

• Used FRACTAL_BACKEND_RUNNER=local instead of local_experimental (#713);
• Moved job submission healthcheck page to user menu (#713);
• Fixed bug in task-groups deletion in admin page (#713);
• Fixed bug in task order modal drag and drop (#713);
• Added admin accounting page (#713);
• Implemented user impersonation (#713);
• Improved error handling in proxy functions and documented the usage of Svelte Kit BODY_SIZE_LIMIT environment variable (#713);