[g13] tarring skim files

[Paul Mattione]

 From the standpoint of cooking, I think the easiest way of writing  
our skims, dsts, monitoring histograms, etc to tape is to combine them  
all into a single tar file for each cooked file.

However, this means that in order to extract your skim you have to  
cache much more (all) of the data from the tapes than if you just had  
a single tar file for a given skim for a given run.  But if you  
combine things by run, if anything needs to be re-cooked (e.g. a  
cooking job fails), you have to re-make all of the tar files  
associated with that run.

How do you guys think we should do it?

- Paul