code: def dallinger_package_path():
      
      dist = get_distribution("dallinger")
      src_base = os.path.join(dist.location, dist.project_name)
  
      return src_base
docs: Return the absolute path of the root directory of the installed
      Dallinger package:
  
      >>> utils.dallinger_package_location()
      '/Users/janedoe/projects/Dallinger3/dallinger'