Add very basic "event" handling in Portal.js; Build sameAs on it

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Additionally replaces a few indexOfs with has_hash, fixes zombie posts hanging around and removes $rotonde from the Portals tab (those fixes could be separated and applied to master, but aren't critical).

Portal now has got a basic onparse handler array, which should contain functions in the format of (json) => {...; return true / false;}, true meaning that the portal will be registered, false meaning that the portal will be ignored. this is the portal the handler's running against at the moment.

The connection queue now accepts objects with url and optional oncreate and onparse handlers. oncreate allows setting is_remote = true; early enough.