6.2.9. Parameter constraints
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"Constraints"
   Type:
      Non-standard block

   Description:
      Parameter constraint rules to apply to the loss function. One
      per line. Use 'p' to reference the parameter set. You may use
      indices or names in square brackets to refer to a specific
      variable.                   Note, that indices are absolute
      i.e., they do not reference the active subset of parameters.
      Eg:                   p[0]>=p[2]
      p['O:p_boc2']==p['H:p_boc2']
