[h5md-user] attribute modification_time

[Felix Höfling]

Hi all,

the /h5md group contains the attribute "creation_time". I suggest to  
provide "modification_time" (or "last_modified") as well to document  
manipulations of the H5MD file after the initial simulation. The  
description could be:

modification_time: The time when then file was modified last. It uses the  
same format as "creation_time". H5MD writers are advised to update the  
field just before closing the file.

What do you think?

Best regards,

Felix