Apply caotto's patch in [2853994] to overhaul wanderers, with a few

tweaks.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@10660 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on September 12, 2009
664OROPKKA6CEBNMMRM67KB4KVKTKFPCHEUWCHZVQVYNKYPHWL4QC
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