Implement automatic setup of replicate calculations

[andrrizzi]

I'm thinking of adding a replicate option in the YAML interface that will instruct the experiment builder to run multiple runs. It would look like something like this

experiments:
  system: t4-toluene
  protocol: binding
  sampler: repex
  options:
    temperature: 298.15*kelvin
  replicates: 5

This would also allow us to perform replicate-informed analysis once the calculation is over.

[jchodera]

Sounds reasonable!