Tweaks the Supermatter a bit

Reduces the amount of heat and power released. Removes redundant code.
Adds Supermatter logging and tweaks the power gen

Now includes an admin_investigate entry, plus three message_admins():
when first powered, when first reaching critical point, and when a mob
is dusted. Also tweaks the power generation formula a bit.
Merge pull request #6444 from tkdrg/shardopplsnerf

Tweaks the Supermatter a bit