Fixed the NPE for fo:title in FOText.createBlockPointers by returning

Fixed the NPE for fo:title in FOText.createBlockPointers by returning
early.

Fixed the absence of output for fo:title: In ContentLM.fillArea, replace
curLM.getNextBreakPoss with getNextKnuthElements, BreakPossIter with
KnuthPossIter. Copied the line parameter calculations from
LineLM.makeLineBreakPosition. This is only a rough patch: leaders,
external graphics, page numbers cause null pointer exceptions.

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@198206 13f79535-47bb-0310-9956-ffa450edef68