Added 'warn_dir' option so other code can sneak in and disable the sometimes inappropriate warning about where we're installing data files.
Added 'warn_dir' option so other code can sneak in and disable
the sometimes inappropriate warning about where we're installing data files.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator