Reverted revision 670341 and replaced it with a different solution as discussed:

Reverted revision 670341 and replaced it with a different solution as discussed:
addCharacters() is now deprecated and called by the new characters() method which uses start/length instead of start/end.
Fixed bugs in the AFP and PS extensions (ArrayIndexOutOfBoundsExceptions). They were not properly changed when the interface changed.
Discussion: http://markmail.org/message/pdgzf6odxrnhflby

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@680378 13f79535-47bb-0310-9956-ffa450edef68