How can I quickly re-save all the nodes on my site (to trigger a rule that activates on content update)? I made some mistakes configuring a certain content type on my site.  To fix these mistakes, I made a rule that performs some actions "when existing content is updated."  However, I don't want to go through my site and manually save all the nodes again one by one.  Is there a way to use Rules or Views Bulk Operations to quickly re-save all the nodes?
VBO has an "Execute PHP code" action. 
Run it, and input "node_save($entity);" (without the quotes) in the textbox.
That will do the trick, while handling the timeouts for you.