error message when this does not work

when export fails, too

new version in PHP. it seems to work, and is more flexible than the
getopt() found in PHP 5.3+.

subset of the functionality of the .NET version; added Display::getEvent
similar to the .NET version; change Dither::bitmap to take a Canvas
object rather than a caca canvas resource as its first parameter; add
Font::Render and Font::getList methods parallel to the .NET version

this is [0, 127], rather than [0, 255]; always free the temporary
pixels copy allocated in PHP_FUNCTION(caca_dither_bitmap); fix a typo
which caused PHP_FUNCTION(caca_set_display_title) to crash due to a
failed run-time binding to "caca_set_display" (the "_title" was
missing).

readability of fullwidth characters better by not placing cell
boundaries between them unneccessarily

(this actually happens with the cocoa driver!)