Thermostating and barostating

[Luthaf]

Another meta-issue about thermostating and barostating the system. There are two ways to do this :

Enforcing the parameters after the integration

This can be done by modifying the current frame after the integration has been performed

• [x] Velocity rescaling thermostat
• [ ] Andersen thermostat
• [x] Berendsen thermostat

  Using a custom integrator

• [ ] Berendsen barostat
• [ ] Nose-Hoover barostat/thermostat
• [ ] Chains of Nose-Hoover barostat/thermostat