remove duplicates from list *preserving order*

[wittempj at hotmail.com]

You could do it with a class, like this, I guess it is a bit faster
than option 1, although I'm no connaisseur of python internals.....
-class uniquelist(list):
-    def __init__(self, l):
-        for item in l:
-            self.append(item)

-    def append(self, item):
-        if item not in self:
-            list.append(self, item)

-l = [1, 1, 2, 3, 3, 4]
-print l
-m = uniquelist(l)
-print m