Openmm

[VGPReys]

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In principle, this PR should "finalize" an acceptable version of the openmm refinement module by adding several improvements to it, such as:

• Function to equilibrate solvation box after its modeling under protein chains constraints
• Adding corresponding parameters (solv_eq*) in the defaults.yaml file
• Improving the defaults.yaml file
• Function to stabilize simulation temperature during equilibration phase
• Generating ensemble/single structure based on user defined parameter
• Also adding the libstdcxx-ng in the installation procedure