title: h5py order of dataset by dataset name
body: <p>I am creating an h5 files with 5 datasets ['a160'],['a1214']</p>
  
  <p>How can I make it so that the datasets will be sorted by the dataset name.. </p>
  
  <p>For example when I do h5dump on my file I get:</p>
  
  <pre><code>HDF5 "jjjj.h5" {
  GROUP "/" {
     DATASET "a1214" {
        DATATYPE  H5T_IEEE_F32BE
        DATASPACE  SIMPLE { ( 1, 19 ) / ( H5S_UNLIMITED, 19 ) }
        DATA {
        (0,0): 160, 0, 165, 4, 2.29761, 264, 4, 1.74368, 1, 0, 17, 193, 0, 0,
        (0,14): 0, 0, 0, 0, 0
        }
     }
     DATASET "a160" {
        DATATYPE  H5T_IEEE_F32BE
        DATASPACE  SIMPLE { ( 3, 19 ) / ( H5S_UNLIMITED, 19 ) }
        DATA {
        (0,0): 263, 0, 262, 7, 4.90241, 201, 34, 0.348432, 1, 0, 29, 11, 0, 0,
        (0,14): 0, 0, 0, 0, 0,
        }
     }
  </code></pre>
  
  <p>But I want it to be ordered by the dataset name, I need h5dump to output</p>
  
  <pre><code>HDF5 "jjjj.h5" {
  GROUP "/" {
     DATASET "a160" {
        DATATYPE  H5T_IEEE_F32BE
        DATASPACE  SIMPLE { ( 3, 19 ) / ( H5S_UNLIMITED, 19 ) }
        DATA {
        (0,0): 263, 0, 262, 7, 4.90241, 201, 34, 0.348432, 1, 0, 29, 11, 0, 0,
        (0,14): 0, 0, 0, 0, 0,
        }
     }
  
     DATASET "a1214" {
        DATATYPE  H5T_IEEE_F32BE
        DATASPACE  SIMPLE { ( 1, 19 ) / ( H5S_UNLIMITED, 19 ) }
        DATA {
        (0,0): 160, 0, 165, 4, 2.29761, 264, 4, 1.74368, 1, 0, 17, 193, 0, 0,
        (0,14): 0, 0, 0, 0, 0
        }
     }
  }
  </code></pre>