v2.2.7

This release includes following new features:

• configuration setting dont_traj to avoid construction of certain perturbation trajectories
• option --enforce-ffatypes to enforce the atom type of some atoms overriding possible automatic assigniation methods

It also includes a compatibility patch for:

• yaff 1.6.0 regarding pickling of the pertubation trajectories

Finally following fixes wer also included:

• bug preventing from specifying list of atom types with --ffatypes
• bug regarding energy noise on perturbation trajectory during parameter estimation
• bug related to bending angles of exactly 180 degrees