Fixes #41.

Original patch courtesy of Romain Bignon.

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

attached to it.

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

inner implementation still only handles one dirty rectangle, but this way
we can prepare supporting applictions for the future.

split is rendered moot by the plugin system: when enabled, binaries do
not link directly with libX11 or libGL. I hope this is a step towards
more consisteny and clarity.

far better for error checking.

* Use size_t and ssize_t where appropriate.

<cucul.h> will provide the C99 types, even if libcaca has been installed.
  * Rename what's left of "common.h" to "stubs.h".
  * Remove all references to erroneous <inttypes.h> from source files.

if they modified it.

without using environment variables..
  * Implement caca_get_display_driver() to return the current display's
    output driver.
  * Add a simple example program to test caca_create_display_with_driver().

direct cv->chars and cv->attrs access by display drivers.

drivers no longer need to access the cv->refcount private member
    and __cucul_set_canvas_size() is no longer needed.

functions to access its real data. This is a big API change that will
    break your software, sorry :(

collisions due to symbol mangling.

* Use caca_set_cursor() in test/input.c.

not exist, courtesy of Ben Wiley Sittler.

about them.

* Do not try to set the terminal title if TERM=linux.

function.

the now official cucul_attr_to_ansi_[fb]g().

functionality into cucul_set_attr().
  * Add cucul_ansi_to_attr() and cucul_argb_to_attr().
  * Rename CUCUL_COLOR_* to CUCUL_*.

as bold or underline. No higher level support for these yet, but at
    least everything is consistent.
  * Created cucul_set_attr_ansi() and cucul_set_attr_argb() which are bound
    to replace cucul_set_color() and cucul_set_truecolor().

and return a value.

* Hack for 16-color support in xfce4-terminal for both ncurses and slang.

* Use that in the SLang driver so that it supports UTF-8 input.

terminal window.

* Add the backspace key to the slang driver.

with "utf8".

in all .c files that needed it.

their name, eg. cucul_create() -> cucul_create_canvas() etc.
  * Moved buffer-related functions to cucul/buffer.c.