frequent screen refreshes.
Implement <conio.h> clreol() (incomplete) and <dos.h> sleep() functions.
Replace some defines with enums in <caca_conio.h>.

a call to clrscr().

printed cells instead of always returning 0. This is handy if we want to
advance a cursor after each printf() call.

they're not actually from that header, they're often used together.

caca_wherey(), in order to match the old <conio.h> naming scheme.

for now because it does not work with fullwidth characters.

speedups when the calling application knows the dirty rectangle covered by
a complex operation.

display driver to clean up its shit. Fixed X11 driver accordingly.

cases, but that can be fixed.

attached to it.

one dirty rectangle, but this is the first step to improvement.

lines, or on changed chars if we have a mask

from generating a huge whatis entry.

different from what was already there.

current canvas. This is useful to export dirty rectangles. Accordingly,
add caca_import_area_from_memory() and caca_import_area_from_file().

a more natural (x,y,w,h) 4-tuple to handle.

every frame, causing the mouse to flicker.