Remove mutually exclusive group from Application

This doesn't make much sense in its current form, opened
issue #11 to work on a better solution.

wilderness/application.py

@@ -240,24 +240,6 @@ def add_argument(self, *args, **kwargs) -> argparse.Action:
  self._arg_help[action.dest] = description
  return action
 
- def add_mutually_exclusive_group(
- self, *args, **kwargs
- ) -> MutuallyExclusiveGroupWrapper:
- """Add a mutually exclusive group
-
- This wraps the `add_mutually_exclusive_group`_ from the argparse
- module, and uses the same positional and keyword arguments.
-
- .. _add_mutually_exclusive_group:
- https://docs.python.org/3/library/argparse.html#argparse.ArgumentParser.add_mutually_exclusive_group
-
- """
- assert self._parser is not None
- _meg = self._parser.add_mutually_exclusive_group(*args, **kwargs)
- meg = MutuallyExclusiveGroupWrapper(_meg)
- meg.command = self
- return meg
-
  def add(self, command: Command):
  """Add a command to the application