[ptx] Bumping version to 2.9.0

[dmg]

Given the problems with the new symbols defined in panotools and hugin
requiring them...

why don't we bump the version of panotools to 2.9.0? 

Hugin's configuration can then be changed to reflect this.

dmg

--
Daniel M. German                  "Poetry is as exact a science
    Gustave Flaubert ->            as geometry"
http://turingmachine.org/
http://silvernegative.com/
dmg (at) uvic (dot) ca
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