* prefix all settings with just "linking."
* rename settings to make more sense
* fix the handling of the "follow" setting
* move the "move" handler to the rescan.lua script, as it's just a rescan hook
When set to 'true', the node will remain alive without any error produced if
it cannot be linked to its specified target; in all other cases, an error will
be produced and the node will be destroyed.
I don't fully remember where this originates from, but it looks like
some sort of hack to workaround a race condition where the event handler
would try to iterate over items that were just created and were not yet
fully ready to be used.
