docs: def load_mplstyle():
      """Try to load conf.plot.mplstyle matplotlib style."""
      plt = importlib.import_module('matplotlib.pyplot')
      if conf.plot.mplstyle:
          for style in conf.plot.mplstyle.split():
              stfile = config.CONFIG_DIR / (style + '.mplstyle')
              if stfile.is_file():
                  style = str(stfile)
              try:
                  plt.style.use(style)
              except OSError:
                  print('Cannot import style {}.'.format(style),
                        file=sys.stderr)
                  conf.plot.mplstyle = ''
      if conf.plot.xkcd:
          plt.xkcd()