Incompatible changes in reportlab-2.4 API

[vokac]

Without this patch Indico can't generate PDF with selected conference abstracts when it is using reportlab-2.4.

diff -NPur MaKaC.orig/PDFinterface/base.py MaKaC/PDFinterface/base.py
--- MaKaC.orig/PDFinterface/base.py     2010-01-08 17:34:42.000000000 +0100
+++ MaKaC/PDFinterface/base.py  2010-03-01 20:09:23.000000000 +0100
@@ -445,7 +445,7 @@
             self.pageTemplates[0].beforeDrawPage = self.onFirstPage
         if onLaterPages is _doNothing and hasattr(self,'onLaterPages'):
             self.pageTemplates[1].beforeDrawPage = self.onLaterPages
-        SimpleDocTemplate.multiBuild(self, story, self._filename, canvasMaker, maxPasses)
+        SimpleDocTemplate.multiBuild(self, story, maxPasses=maxPasses, canvasmaker=canvasMaker)
     
     def getCurrentPart(self):
         return self._part