h4h5tools

HFRHFVTOOLS-120,HFRHFVTOOLS-122,
1) Fix issues that cause the segmentation fault of the tests with HDF5 1.10.1. The conversion tool needs to close the compound datatype. This is fine with 1.8 and before but not for 1.10.
2) Fix a few memory leaking issues in the conversion toolkit. Some allocated memories are not free properly.
TODO: 1) continue fixing the memory leaking issues. 2) h5diff in 1.10.1 has some issues to retrieve string types. Need to figure out a workaround.