hdf5_ep

[svn-r4369] 
Purpose:
     add a real raster-24 bit testing for interlace mode.
Description:
     1. GR interfaces will never create an HDF4 file with interlace mode other than
     pixel interleaved. DF24 interfaces can create HDF4 file with different interleaved.
     There are inconsistent behaviors between GRreqimageil and GRreadimage, data read into     the memory will not behave properly if a new interlace mode is asked.
     2. Currently HDF5 image spec. supports pixel interleaved and plane interleaved.
      We make a real image file to test whether the converter is doing the right thing.
Solution:
     We use DF24 bit APIs to generate a real image file that can be tested by H5view.
Platforms tested:
     linux and sol2.7