Implement FR#2365870: Hill Orcs as dirty fighters by giving them aptitude 70 in Stabbing. (Their Stealth apt is 150). Also adjust their Summoning aptitude from 120 to 100 in trying to make HOSu attractive. This is a buff to an already strong race, but they got their MR lowered (still experimentally) in r10467 along with MD, while being weaker of the two. These changes differentiate HO and MD a bit. The downside is that HOPr benefit from this boost without really needing a buff.

Also adjust manual regarding the changes in this commit and in r10467.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@10592 c06c8d41-db1a-0410-9941-cceddc491573

Created by  evktalo  on August 22, 2009
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