Verbiage tweak: block design rather than system design
Added missing simulation options to 32nm Nehalem test case

use_graphene and separate_wiring_tiers were added later for additional
control over the innards of the virtual platform
Added 32nm Sandy Bridge datasheets for validation

Thermal data in lga115-socket-guide is especially useful
Tweaked 32nm sandy bridge sim settings to be more uniform

Original settings were a bit cherrypicked. Current settings are
reasonable, more uniform, and still give good agreement to power,
thermal, and wire data.