iFit/refine_crystal

 Refine crystal orientation and lattice parameters for a d3d object.

   >> [rlu_corr,alatt,angdeg] = refine_crystal(w, rlu0, rlu)
   >> [rlu_corr,alatt,angdeg] = refine_crystal(w, rlu0, rlu, alatt_init, angdeg_init)

 In addition, there are keyword arguments to control the refinement e.g.
   >> [rlu_corr,alatt,angdeg] = refine_crystal(..., 'fix_angdeg')
   >> [rlu_corr,alatt,angdeg] = refine_crystal(..., 'free_alatt', [1,0,1])

 In all cases, further output arguments can be returned:
   >> [rlu_corr,alatt,angdeg,rotmat,distance,rotangle] = refine_crystal(...)


 For full details of the arguments, type:

   >> help sqw/refine_crystal

 The help is identical, except here the input object is a d3d object