Minimum offset

• Minimum offset:

  Change regarding the enforced minimum horizontal offset, which can be set
  through empymod.set_minimum(min_off=1e-3), where 1e-3, hence 1 mm, is the
  default. Until now, responses for smaller offsets were set to NaN. New, they
  return the response for the minimum offset. The raised warning stays the
  same.

• Maintenance

  • Exclude scipy!=v1.9.0 from MacOS/Windows test.
  • Replace pytest-flake8 by plain flake8.
  • Change the way spacing and shift are calculated in
    fdesign.print_result to avoid numerical precision issues.
  • Replace deprecated sphinx-panels with sphinx-design.