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##### SUMMARY
When I read the `copy` documentation, I couldn't work out what it meant.  Unfortunately, this meant it sounded like it might be a weird sex joke.

It doesn't sound like a big problem, but in an ideal world, I think we should prefer to avoid weird sex jokes in an alias for a parameter called `force`.

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
copy

##### ADDITIONAL INFORMATION
Issue search tells me "thirsty" was added as an option to the `get_url` module.  In that context, it is appropriate.  But in the context of the `copy` module, it does not make sense, because `copy` only works in the upload direction.

The first three pages of Google Search results (Ansible thirsty) show people using "thirsty" for downloads only, not uploads.  Similarly for GitHub code search (copy thirsty language:YAML).
''' return from the module, without error '''
        self.do_cleanup_files()
        self._return_formatted(kwargs)
        sys.exit(0)
    def fail_json(self, **kwargs):
        ''' return from the module, with an error message '''
        if 'msg' not in kwargs:
            raise AssertionError("implementation error -- msg to explain the error is required")
        kwargs['failed'] = True
        
        
        if 'exception' not in kwargs and sys.exc_info()[2] and (self._debug or self._verbosity >= 3):
            if PY2:
                
                kwargs['exception'] = 'WARNING: The below traceback may *not* be related to the actual failure.\n' +\
                                      ''.join(traceback.format_tb(sys.exc_info()[2]))
            else:
                kwargs['exception'] = ''.join(traceback.format_tb(sys.exc_info()[2]))
        self.do_cleanup_files()
        self._return_formatted(kwargs)
        sys.exit(1)
    def fail_on_missing_params(self, required_params=None):
        if not required_params:
            return
        try:
            check_missing_parameters(self.params, required_params)
        except TypeError as e:
            self.fail_json(msg=to_native(e))
    def digest_from_file(self, filename, algorithm):