docs: def reload_pimms():
      '''
      reload_pimms() reloads the entire pimms module and returns it.
      '''
      import sys, six
      try:    from importlib import reload
      except: from imp       import reload
      reload(sys.modules['pimms.util'])
      reload(sys.modules['pimms.table'])
      reload(sys.modules['pimms.immutable'])
      reload(sys.modules['pimms.calculation'])
      reload(sys.modules['pimms.cmdline'])
      reload(sys.modules['pimms'])
      return sys.modules['pimms']