Add exit code for experiment links
1) push/merge the existing change for exit code/experiment links to
the spreadsheet page in POMS
2) Currently the failed_jobs_by_whatever page makes the exit code a
link to the tasks which failed with that exit code; we should
make it a link to the experiment exit code description, and the
count be a link to the jobs in question.
Basically, we can only do this in number 2 if the "experiment" column
is included... I can put in a patch to always include experiment...
Okay, did that in 18c7ae4 -- now we should always have an
experiment in each row...