Some more Stealth changes.

(1) Use diminishing returns for passive training depending on skill level. Below skill level 2, chances are unchanged; at level 2 chances are 2/3 of that, and at level 3 at 1/3. From level 4 onwards, Stealth cannot be trained by waiting anymore.

(2) Active stealth training only has a 1% chance (instead of 5%) if you're sneaking around monsters while invisible (and the monster cannot see you).

Add yet another function for blood potions - I sure hope this works when I eventually get around to actually use them.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4178 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on April 10, 2008
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