Document new file() constructor, with the body of open()'s text, plus a "new in 2.2" blurb at the end.  Replace open()'s text by pointing back to file().
Document new file() constructor, with the body of open()'s text, plus a
"new in 2.2" blurb at the end.  Replace open()'s text by pointing back
to file().

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