[Therion] Altitude colors range

[Wookey]

+++ Stacho Mudrak [2015-01-08 21:11 +0100]:
>    Wrong colors with centerline attached is a bug, that has allways been
>    there. Just change thscrap.cxx:68 and next line to
>            this->z = thnan;
>            this->a = thnan;
>    and it should be fixed (if you can compile therion). Thanks for finding
>    this out.

OK. I've added that patch to the debian package in 5.3.16-5. Uploaded
to experimental just now.

Feedback on whether it fixes the problem would be appreciated. 

Wookey
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