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Update of documentation: doc/customizing.txt
The attached patch (against CVS from some minutes ago)
updates the documentation for the new setlabelprop method.
It also documents setorderprop detailed in the following
feature-request:
https://sourceforge.net/tracker/index.php?func=detail&aid=1379534&group_id=31577&atid=402791
So you may need only half of this patch if setorderprop is
not implemented.