[iceape] Missing bug-closer in SVN

[Andreas Metzler]

This

  * debian/README.Debian: Rewrote, stealing stuff we wrote for
    firefox^Wiceweasel, including a note about Emacs key bindings.
    Closes: #291418, #292435, #294542, #296347, #306213.

also closes #199090.
cu andreas
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