RF - use arrayproxy object for Analyze, MGH format

Arrayproxy is now capable of supporting Analyze / Nifti types and MGH
types.

Author: matthew-brett

nibabel/analyze.py

@@ -899,18 +899,7 @@ class AnalyzeImage(SpatialImage):
     files_types = (('image','.img'), ('header','.hdr'))
     _compressed_exts = ('.gz', '.bz2')
 
-    class ImageArrayProxy(ArrayProxy):
-        ''' Analyze-type implemention of array proxy protocol
-
-        The array proxy allows us to freeze the passed fileobj and
-        header such that it returns the expected data array.
-        '''
-        def _read_data(self):
-            fileobj = allopen(self.file_like)
-            data = self.header.data_from_fileobj(fileobj)
-            if isinstance(self.file_like, basestring): # filename
-                fileobj.close()
-            return data
+    ImageArrayProxy = ArrayProxy
 
     def get_header(self):
         ''' Return header

nibabel/freesurfer/mghformat.py

@@ -429,18 +429,7 @@ class MGHImage(SpatialImage):
     files_types = (('image', '.mgh'),)
     _compressed_exts = ('.mgz',)
 
-    class ImageArrayProxy(ArrayProxy):
-        ''' Analyze-type implemention of array proxy protocol
-
-        The array proxy allows us to freeze the passed fileobj and
-        header such that it returns the expected data array.
-        '''
-        def _read_data(self):
-            fileobj = allopen(self.file_like)
-            data = self.header.data_from_fileobj(fileobj)
-            if isinstance(self.file_like, basestring):  # filename
-                fileobj.close()
-            return data
+    ImageArrayProxy = ArrayProxy
 
     def get_header(self):
         ''' Return the MGH header given the MGHImage'''