Add new unique gnoll Grum, courtesy of Eino's patch. Thanks!

Also added a preliminary tile.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@10070 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on June 28, 2009
BNE3OKRCLL3BVGH7RSLHXU7E6IVDNII3GUCUDM6W4T7UCU6XQ7HQC
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