Re-Implemented "quality" rendering mode (painting borders and rules using bitmaps).

Re-Implemented "quality" rendering mode (painting borders and rules using bitmaps).
Added a new rendering mode "bitmap" (in addition to "speed" and "bitmap") that uses Java2DPainter for the whole page and paints a single bitmap (much like most PCL drivers operate). Quality: "speed" < "quality" < "bitmap", Performance: "speed" > "quality" > "bitmap" (at high page complexity "bitmap" might actually be better), File Size: "speed" < "quality" < "bitmap"
Increased bitmap encoding performance by up to 100% (by optimizing the Java code and by supporting the "zeroed row" PCL command)

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/branches/Temp_AreaTreeNewDesign@709119 13f79535-47bb-0310-9956-ffa450edef68