hdf5_ep

[svn-r20489] Bug 1386 - allow dimension size to be zero even though it isn't unlimited.  I brought the changes from the trunk as below:
1. I added test cases for contiguous, compact, and chunked, and external storage datasets, and also attribute.  
   The test includes dataspace selections.
2. I added a test case of extending dataset of zero dimension size and shrinking back to zero dimension size.
3. I updated the Makefile to include the new data file to be cleaned up.
4. The dataspace code has another bug - when the maximal dimension isn't passed in for H5Sset_extent_simple, it
   is supposed to be same as the dimension.  The current library sets NULL to it.  I corrected it and added a
   test case to it.
5. I corrected the tests of Fortran and C++ for the problem in point 3.

Tested on jam, heiwa, and amani.