Addition of walk, that finds all groups in a H5MD file.
Addition of check_file.py that performs basic checks on a H5MD file.
Update of run_h5md.py example and addition of companion analyze_h5md.py.
Update of the check routine. The class Walker finds all H5MD compliant groups in a given group (typically trajectory or observables). It is used in the check function.
Cleanup of the Walker and check code.
Addition of a close method.