[Xy-pic] curved arrows and non-rectangular shapes

[Stefan Fink]

Hi Ross,

thanks for the quick fix. I just reported the availabilty of this patch 
to the Debian maintainers, since it's the distribution I use. Hopefully, 
it will be integrated soon.

Greetings, Stefan.

>Hello Stefan,
>
>Thanks for the useful example, which has helped to pin-point
>the bug, which has be suspected for some time.
>
>The problem was due to the edge-type of the target node
>being ignored when computing the spline-parameter value
>of the edge-point along the curve, thus resulting in an
>incorrect value being used.
>
>Two small edits within  xycurve.tex  are sufficient
>to patch the code to work correctly.
>
>The (tar, gzip'd) archive:
>
>   http://www-texdev.ics.mq.edu.au/xypic/xymods.tgz
>
>contains a corrected version of xycurve.tex
>along with various other corrections to Xy-pic that
>have been discovered since the 3.7 release.
>(including those you mention below).
>
>  
>