added from symphony, also BMP_SCALE_LANCZOS, BMP_SCALE_BICUBIC,
BMP_SCALE_BILINEAR and BMP_SCALE_BOX.

Changed defaults for internal scalings, enhanced PDF export when reduched DPI
is used, added BMP_SCALE_BESTQUALITY and BMP_SCALE_FASTESTINTERPOLATE as new
default for Bitmap::Scale

(cherry picked from commit bf734a15)

Conflicts:
	canvas/source/vcl/canvasbitmaphelper.cxx
	canvas/source/vcl/canvashelper.cxx
	sd/source/ui/slidesorter/cache/SlsGenericPageCache.cxx
	vcl/inc/vcl/alpha.hxx
	vcl/inc/vcl/bitmap.hxx
	vcl/inc/vcl/bitmapex.hxx
	vcl/source/gdi/bitmap3.cxx
	vcl/source/gdi/impgraph.cxx
	vcl/source/gdi/pdfwriter_impl2.cxx
	vcl/source/helper/canvasbitmap.cxx

(cherry picked from commit 593c86280b64d97725adde0c0a0cc4f090fb2310)

Change-Id: I41cf0a7e11bdbc6510e22e762486420995ba739b