Add '-p' flag to h5copy tool, to create intermediate "parent" groups
that don't exist in destination file yet.
Add more tests to h5copy script.
Tested on:
Linux/32 2.6 (chicago)
Linux/64 2.6 (chicago2)
Add empty & "full" groups to source HDF5 file and test copying them.
Test renaming objects during copy
Test specifying root group path for source & destination objects
Tested on:
Linux/32 2.6 (chicago)
Too minor to require more tests
