Implement Savina benchmarks that require mutations

[lhstrh]

From the Savina paper:

• Sieve of Eratosthenes (@lhstrh)
  • Make sure Sieve uses new API, and support two hierarchical topologies Add relatives functionality for mutations, and fix Sieve #193
• Unbalanced Cobwebbed Tree (@hokeun)
• Online Facility Location (@hokeun) (broken)
  • Verify facloc fix is correct (@axmmisaka) Fix Online Facility Location #226
• Successive Over-Relaxation (@axmmisaka) [WIP] Savina Successive Over Relaxation  #225
• Quicksort (@axmmisaka ) Quicksort in Savina #204
• Fork Join (actor creation) (@axmmisaka) Savina Fork Join (Create) #205

See the Savina GitHub for reference implementations.

[hokeun]

Started working on Online Facility Location in branch savina-facloc.

[hokeun]

I realized that the UCT (Unbalanced Cobwebbed Tree) benchmark would require banks as it creates a tree structure with an arbitrary number of children (actors).

[lhstrh]

Maybe we should just bite the bullet and create support for banks?

[hokeun]

Maybe we should just bite the bullet and create support for banks?

Sounds good to me. Let me finish the implementation of the Online Facility Location first and add support for banks when I start working on UCT.