Thumnails now created with a palette to fix incorrect colour rendition. Thumnails output to a 32bpp sprite where possible. Thumnails oversampled to improve display if desired. svn path=/import/netsurf/; revision=744
Use save area when redirecting to sprite. svn path=/import/netsurf/; revision=570
Implement scaling; rewrite desktop/browser; add riscos/thumbnail; rewrite history. svn path=/import/netsurf/; revision=566