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They should be in a numeric array, already formatted as headers,
ready to go. (Header-Name: Content of the header)

sets the hashkey column of the row to sha1(topic + '|' + callback)

Set $config['fix']['legacy_http'] to perform some actions that are
needed if your site used to be served over http but now has upgraded
to https!

Avoids overloading and lets dataobject classes use onUpdateKeys()
to do special stuff, like if a key is made up of a hash of other fields etc.

It is argued there are many better ways to get a "micro summary" of
a profile or site.

Note that these won't be shown to the enduser and will never be accessed automatically.

We should put the salmon-protocol stuff on ostatus.org