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HTML lets us put the input element inside the label and then they
are automatically paired, but this is more explicit and clear imho.

Checked all checkboxes on http://jqueryui.com/download/

Source: https://plugins.jquery.com/cookie/

...why we now need a JSON library... _in_ Javascript?!
Source: http://www.json.org/js.html

Source: http://malsup.com/jquery/form/

Let's get the AJAX response and present it to the user with the same
mechanisms for all actions, instead of having a bunch of javascript
for various circumstances (fave, repeat, delete should all be the same
behaviour for example).

The DefaultLayout plugin will come with options to render various parts
of the page by default or not. The expected default behaviour will try
to imitate the original StatusNet/GNU social looks as far as possible.

Also we're moving the rendering of these out into a separate plugin. Not
done yet, some javascript should be moved out as well.

Also fixes some comments and uncertainties in the beginning of the
class definition.

Upstream bug causing (int)0 to be interpreted as a "null string":
https://pear.php.net/bugs/bug.php?id=20291

Browsers should be secure enough by now for this.

Sometimes we just want to accept the user's wrong, but when it comes
to remote APIs etc. we probably want to let the client know it has
done something already (in this case multiple identical subscription
requests - which might indicate to it that it should refresh the sub
lists or something).