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r4456 | helixhorned | 2014-04-29 12:34:25 -0700 (Tue, 29 Apr 2014) | 4 lines

engine.c: after creating gray fog palookup, make its greatest shade map to same color.

Concretely, for all 1 <= i <= 255, make graypalookup[31][i] := graypalookup[31][0].
Also document 'fogpal' in the Lunatic doc.
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