Changed subprocess.call for repack to no longer send sys.stderr as stderr. ...

Changed subprocess.call for repack to no longer send sys.stderr as stderr.  This breaks in iPython because it overwrites the stderr with an ioStream that cannot be treated as a file.

pycroscopy/io/io_hdf5.py

@@ -50,7 +50,7 @@ class ioHDF5(object):
             except:
                 raise
             self.path = file_handle
-        elif type(file_handle) == h5py._hl.files.File:
+        elif type(file_handle) == h5py.File:
             # file handle is actually an open hdf file
             if file_handle.mode == 'r':
                 warn('ioHDF5 cannot work with open HDF5 files in read mode. Change to r+ or w')
@@ -85,7 +85,7 @@ class ioHDF5(object):
         '''
         try:
             repack_line = 'h5repack '+self.path+' '+tmpfile
-            subprocess.call(repack_line,stderr = sys.stderr,shell=True)
+            subprocess.call(repack_line, shell=True)
             sleep(2)
         except:
             print('Could not repack hdf5 file')
@@ -98,13 +98,14 @@ class ioHDF5(object):
             os.remove(self.path)
             os.rename(tmpfile, self.path)
         except:
-            raise #StandardError(os.error)
+            print('Could not copy repacked file to original path.')
+            raise StandardError(os.error)
         
         '''
         Open the repacked file
         '''
         self.file = h5py.File(self.path, mode = 'r+')
-    
+
     def close(self):
         '''Close h5.file'''
         self.file.close()