add functionality to determine up-state for hets
add functionality to determine up-state for hets

Before save-actions occur we should perform
a reachability test. This will allow us to
check whether a hets-instance is 'up' and
to retrieve the version which it is using.

ontohub/ontohub,ontohub/ontohub,ontohub/ontohub,ontohub/ontohub,ontohub/ontohub,ontohub/ontohub