old_contents: # Additional configuration
  
  # User defined global variables
  
  # Snack calling method
  # Choices are 'exe', 'python', 'tcl'
  # Setting it to None, uses the default for your operating system
  user_default_snack_method = None
  
  # Tcl shell command name
  # Typically, something like 'tclsh', 'tclsh8.4', 'wish', 'wish8.4', etc.
  # This can be useful for calling a particular version of Tcl, e.g. call Tcl8.5
  # by setting the variable to 'tclsh8.5'
  # If the variable is set to None, 'tclsh8.4' is used on OS X;
  # otherwise 'tclsh' is used
  user_tcl_shell_cmd = None
  
new_contents: # Additional configuration for testing purposes
  # Do not change this file unless you are a developer or advanced user
  # Users should set these options through the command line interface
  
  # User defined global variables
  
  # Snack calling method (equivalent to --snack-method CLI option)
  # Choices are 'exe', 'python', 'tcl'
  # Setting it to None, uses the default for your operating system
  user_default_snack_method = None
  
  # Tcl shell command name (equivalent to --tcl-cmd CLI option)
  # Typically, something like 'tclsh', 'tclsh8.4', 'wish', 'wish8.4', etc.
  # This can be useful for calling a particular version of Tcl, e.g. call Tcl8.5
  # by setting the variable to 'tclsh8.5'
  # If the variable is set to None, 'tclsh8.4' is used on OS X;
  # otherwise 'tclsh' is used
  user_tcl_shell_cmd = None
  
subject: Add comments to userconf.py