levels don't lose following monsters.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1661 c06c8d41-db1a-0410-9941-cceddc491573
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while (!followers.empty())
{
follower f = followers.front();
followers.erase(followers.begin());
f.place(true);
}
place_followers();