Deprecate (not delete) Outputter.initialize.

Author: Ben Cipollini

nibabel/gifti/parse_gifti_fast.py

@@ -336,6 +336,9 @@ class Outputter(GiftiImageParser):
     def __init__(self, *args, **kwargs):
         super(Outputter, self).__init__(*args, **kwargs)
 
+    def initialize(self, *args, **kwargs):
+        self.__init__(*args, **kwargs)
+
 
 @np.deprecate_with_doc("Use GiftiImageParser.parse() instead.")
 def parse_gifti_file(fname=None, fptr=None, buffer_size=None):

nibabel/gifti/tests/test_parse_gifti_fast.py

@@ -325,6 +325,7 @@ def test_parse_deprecated():
         warnings.filterwarnings('always', category=DeprecationWarning)
         op = Outputter()
         assert_equal(len(w), 1)
+        op.initialize()  # smoke test--no error.
 
     with clear_and_catch_warnings() as w:
         warnings.filterwarnings('always', category=DeprecationWarning)