Qualify "additional copies == new license" claim.

The last commit brought in text that categorically claims: "automatic
termination cannot be cured by obtaining additional copies from an
alternate supplier". While this position is by far the overwhelming
majority position among copyleft advocates, theorists, and legal
experts, the small minority dissenting opinion is simply too strongly
sourced to ignore.

Specifically, Till Jaeger's position was central to Harald Welte's
gpl-violations.org community-oriented GPL enforcement efforts.
Therefore, this tutorial must include his position when covering the
issue of automatic license reinstatement in this tutorial.

I have told Till that I can't believe his position is possibly correct.
(I understand that many other copyleft theorists and legal experts have
done so as well.) However, Till remains steadfast that this position is
correct, at least under German copyright law. Speaking for myself, I
have never met a legal expert as well-versed in both copyleft and German
copyright law as Till Jaeger is, and therefore I cannot in good
conscience allow this tutorial to remain silent regarding Till's
position, lest the tutorial propagate an inappropriate bias for the
majority belief.

That said, I still feel that a footnote is the right place for the
argument. It *is* a tiny minority position [0] among an overwhelming
consensus to the contrary, and therefore adding the point to the main
text would only serve to distract the tutorial reader.

[0] In particular, I am convinced Jaeger's argument, if true, is a
peculiarity of German law exclusively. For example, French lawyers
I've spoken with believe that the standard USA legal position on
this issue is also accurate under French copyright law. I therefore
conclude the minority position (if accurate) is unrelated to
differences between civil law and common law copyright regimes, and
is instead a unique peculiarity to German copyright law.