- read sranger_mk2_hwi_mix0_set_point (new), then try reading
  sranger_mk2_hwi_mix0_current_set_point (old)


git-svn-id: svn://svn.code.sf.net/p/gwyddion/code@16816 25697fe4-d644-49b8-9d30-be5465f2adf3