Re #6699. Change from absolute to relative paths.
Re #6699. Added usage of archive search if user requests.

Since several people have the full data mounts to their desktops,
I added enough code to take advantage of it for the required file
check and test running.
Re #6699. FileFinder.findRuns throws an uncaught exception.
Merge remote-tracking branch 'origin/feature/6699_powder_files'