hdf5

[svn-r13134] 
New version of the function h5tools_dump_simple_subset, to display subsetting. The new algorithm is: 
Introduced an outer loop for cases where dimensionality is greater 
 than 2D. In each iteration a 2D block is displayed by rows in a inner
 loop. The remainning slower dimensions above the first 2 are incremented 
 one at a time in the outer loop

Note: when blocks are introduced, the display is not correct. This is a bug that requires an improvement of the algorithm.