Add stats for Istanbul

Also fix istanbul event generation to not generate a bogus
division file that causes make_summary to get stuck in an infinite loop.
That was straightforward, hopefully it doesn't break anything else.
Add sandybridge-ep results
Have Sandybridge Load/Store properly reported as Uop event
fam10h has no div event, these are bogus files that break make_summary
Add Phenom results
Most recent version of the conversion routine.

I used this to convert old results from machines I no longer have
access to.  Other results I had re-run.