The return values from workorder accessors are more reliable and the...

The return values from workorder accessors are more reliable and the infrastructure to handle workorder threads is in place Fixes #5082

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/branches/ipce@7904 41f8697f-d340-4b68-9986-7bafba869bb8