Add more statistics or data insights

[smessie]

• (Forward standard numbers/statistics to HOIs after exam periods), although adding it to the stats page is probably better
  • Where are our students going to study
  • Who is coming to study at our college

-> let them manually choose a start and end time for the stats.
-> let them choose a HOI or all for students, let them choose a HOI or all for college
==> this makes every combination possible