caca_get_dither_algorithm

* Add just_for_fun() function in sample program drivers.php

* Add new sample program "examples/drivers.php"

* Rename php function caca_import_memory to caca_import_string
* Add sample program "text.php" (php port of examples/text.c)
* Add php binding for "caca_set_attr"

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

* Add "full" demo to "examples/demo.php"

* Improve examples/demo.php

* Create a new sample file demo.php (php port of demo.c)

sample program examples/example1.php

* Animate pink pig & add event managment in sample program "example1.php"

* Add a nice php sample file examples/example1.php that shows a smart pink ping

* Add php binding for 13 new functions

Updated NEWS and ChangeLog.

incorrectly detcted as present because gcc was optimising them away.