updating version of itext to 2.1.2u

Files:
deleted: /trunk/processing/pdf/library/itext.jar
added: /trunk/processing/pdf/library/iText-2.1.2u.jar (try)
deleted: /trunk/processing/pdf/itext-src-1.4.2.zip
added: /trunk/processing/pdf/iText-src-2.1.2u.zip (try)