Polyline creation

[Lars Clausen <lrclause cs uiuc edu>]

Following up on my previous mail, I looked into making polyline use its
user_data to initialize points.  It took me down into lib/polyconn.[ch]
(and around a memory leak in object_copy!), but it's available now.  Since
I'm at a foreign computer, please check if polyline creates and copies
properly in the newest CVS.  Once that's working, I shall update
xfig-import to make use of it, and do the same for beziers and polygons.
Yay! 

-Lars

-- 
Lars Clausen (http://shasta.cs.uiuc.edu/~lrclause) | Hårdgrim of Numenor
"I do not agree with a word that you say, but I    | Retainer of Sir Kegg
will defend to the death your right to say it."    |   of Westfield
    --Evelyn Beatrice Hall paraphrasing Voltaire   | Chaos Berserker of Khorne