Fixing examples

Project to fix the Einstein Toolkit example parameter files

See #641.

(Ian)

I have submitted all arrangements/*/*/par/*.par files on 12 cores on datura, to get a first estimate of what happens.

There are 228 such files (in my current trunk checkout)
146 of them (64%) ran and output the line "Done."
27 (12%) of them took more than a few minutes to run (maybe because they are swapping due to needing more nodes)
88 (34%) failed due to needing thorns which were not available.

So 228 - 88 - 27 = -33 probably failed with some sort of fatal error. Something is wrong there. Need to check.