Change mummy curses to only turn part of a stack of potions into decay.

Instead, the amount is 2 + random2(quantity - 1), so ranging anywhere from 2 to the entire stack.

Yes, I know this is probably highly controversial, but I've thought about it some, and I think that this will actually change little for most characters: You still won't take large stacks of valuable potions into the Tomb since even if only part of the stack is destroyed it's a huge loss. On the other hand, this is easier on newbies who had no idea this could happen, and makes it a bit more harder for Transmuters to turn their twenty-something potions of water into decay.

I also added a message ("Your potions of xyz decay.") if you know the decay type. Otherwise the message is suppressed, so as to replicate the current situation of "Hey, what's this? When did I pick up those? (q)uaff…" For consistency, I also added a message when stuff is cursed, or rather I merged all those "Your foo glows black" messages into do_curse_stuff() that now takes a parameter "quiet" to control whether it's printed ot not.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4438 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on April 21, 2008
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