[PATCH] centralised definition for surface pressure

[Jan Schubert]

This patch centralizes the definition for surface pressure by
eliminating 11 (!) occurrences of definitions for surface pressure, feel
free to find more :-).
It also removes a few occurrences of definitions for oxygen in air.
And finally, to do some more code beautifying it also removes the
unneeded variable entry_ead in gtk-gui.c.

Jan

Signed-off-by: Jan Schubert / Jan.Schubert at GMX.li


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Jan Schubert                         Jan.Schubert at doubleSlash.de
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GF: Oliver Belikan, Konrad Krafft, Jan Schubert, Andreas Strobel

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