Fixed bug in scaling calculations.
Improved colour reproduction for <16bpp.
Improved dithering algorithm for >1bpp and <32bpp.
Implemented all opaque plotters for >4bpp.
svn path=/import/netsurf/; revision=613
Tinct, suitable for Iyonix/Omega users. Does not currently support scaled plotting in 1bpp, 2bpp or 4bpp, or bilinear filtering.
svn path=/import/netsurf/; revision=600