[osg-submissions] write tiff with float

[christophe loustaunau]

Hi,

For our application, we need to write tiff file in floats. I have change a
little bit the readerWritterTiff :
It check the data type of the image ( img.getDataType() ) and if it's
GL_FLOAT :It save the tiff with float values.
Otherwise it does the same thing as before.

Here is a the file ReaderWritterTiff.cpp and a patch based on the latest svn
version.

Regards.
-- 
Christophe Loustaunau.
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