Document this plugin and joeyh's suggested to-do items.

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+[[!template id=plugin name=proxies author="[[schmonz]]"]]
+[[!template id=gitbranch branch=schmonz/proxies author="[[schmonz]]"]]
+[[!tag type/format]]
+
+This plugin enables ikiwiki to open outbound connections (such as
+found in [[plugins/aggregate]], [[plugins/openid]], and [[plugins/pinger]])
+via a proxy. The proxy can be configurably avoided for connections
+to certain domains.
+
+### To do
+
+* Move duplicated user-agent setup out of other plugins into this one.
+* While I'm at it, fix [[bugs/http_proxy_for_openid]].