"drush node-access-rebuild-progressive" should not rebuild access grants if not needed

Well, this patch isn't having the module pick up where it left off in my case. I had a job die part way through (through no fault of this module)

I also encountered this problem (Drush command crashing while processing nodes). Relaunching the Drush command will not process the remaining nodes, however it seems the cron will correctly pick up where drush stopped.

Here is a reroll for 2.0.1.

We still need to add an option so the command could still be used to force a rebuild.