hdf5_ep

[svn-r26297] Changed example and h5dump according to suggestions at today's code review VDS-176.
BNF has been updated too. Now h5dump displays VDS like this:

HDF5 "vds.h5" {
GROUP "/" {
   DATASET "VDS" {
      DATATYPE  H5T_STD_I32LE
      DATASPACE  SIMPLE { ( 4, 6 ) / ( 4, 6 ) }
      STORAGE_LAYOUT {
         VIRTUAL {
             HYPERSLAB { (0,0)-(0,5) };
             a.h5;
             A;
             ALL;
             HYPERSLAB { (1,0)-(1,5) };
             b.h5;
             B;
             ALL;
             HYPERSLAB { (2,0)-(2,5) };
             c.h5;
             C;
             ALL;
            }
         }
      }
      FILTERS {
.......
I just commented the code with "EIP" and didn't delete to simplify the review with Allen tomorrow.

Tested on jam