a) Fix for cfb_imagblit so it can handle monochrome bitmaps with widths not multiples of 8.

b) Further optiminzation of fast_imageblit by removing unnecessary steps from its main loop.

c) fast_imageblit show now work for bitmaps widths which are least divisible by 4. 4x6 and 12x22 shoudl use fast_imageblit now.

d) Use hadrware syncing method of hardware if present.

e) trivial: wrap text at 80 columns. 

[RIVA and 3DFX] imageblit functions busted for large images. Use generic functions for now.

Several syncing issues fixed between the accel engine and access to the framebuffer is several files.