pipi_load, pipi_save, pipi_command, pipi_render_histogram, 
     pipi_get_image_histogram
 * Add pipi's php constants definitions


git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@3087 92316355-f0b4-4df1-b90c-862c8a59935f

Add a php rewrite of pipi.c in examples/


git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@3086 92316355-f0b4-4df1-b90c-862c8a59935f