Add a button to compare a jobset eval against other jobsets

So now "?compare=<jobset name>" is no longer a hidden feature!

P.S. Encountered this wonderful TemplateToolkit brainfuck again: if you want to get the number of rows in (say) project.jobsets, you can't say "project.jobsets.size". That will usually give the right result, except that if there is only one row in project.jobsets, it will evaluate to 3. Instead you have to use "project.jobsets_rs.count".

Created by  Eelco Dolstra  on March 5, 2013
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