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

* Add php bindings for caca_get_dither_antialias_list, caca_render_canvas
* Add a new sample program examples/render.php

* caca_dithering_bitmap can load palette from gd resource
* Remove caca_set_dither_palette_gd function
* Adapt sample program "dithering.php"

* caca_get_event return false if type == CACA_EVENT_NONE otherwise return a new
  php resource
* Adapt sample program demo.php

* Add a working sample file examples/figfont.php
* Rename sample programs:
     examples1.php > cacapig.php
     drivers.php > cacainfo.php

* Modify php bloc headers in samples programs
* Add list of import/export formats in examples/drivers.php

given gd resource.

* Add php binding for "caca_create_dither"
* Add new sample program "dithering.php"

resources such as gd resouces
* Add test for presence of gd development files in config.m4
* Rename php function caca_dither_bitmap in caca_dither_bitmap_gd

* Add binding for 2 new functions
* Fix a bug in examples/example1.php

* Improve examples/demo.php

* Add php binding for 13 new functions