Nerfs Prime

This makes the Prime stat-mutations track a wider range of stats.  So now, if you're artificially low thanks to a freak accident with minmaxing, or extremely high thanks to overspending in chargen, you'll get appropriately buffed.

Further, Purifier's efforts to restore you to baseline now can undo the perfection you've worked so hard to build.  So be careful.  ;-)
Bracketing nit, 1tbs wants the else on the same line as the closing brace.
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