--field option not always declared

[weitzman]

Oddly, I am seeing the --field option when viewing help but not when used. I think this is a useful option so lets keep it if possible: For example:

1. Good, Displays --field properly: drush help user-information
2. Bad, "Unknown option: --field": drush user-information --uid=1 --field=user_status

Note that the --fields and --format options are working fine.