License change

[Micha B. <kri...@us...>]

@all

Hope, I can clarify licensing issues a bit. I made the following change
to Qwt3D's license:

http://tinyurl.com/6om7m

This constitutes essentially the zlib license. LGPL remains an
alternative up to the release of the next version of Qwt3D. An
alternative - feel free to use the new license for the recent and older
versions of the library.

Micha
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