* Centralize pipi's errors managment in macro RETURN_SUCCESS
* Change php headers in samples programs
* Add binding for pipi_draw_line
* Check args in pipi_new_histogram and pipi_get_version
git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@3170 92316355-f0b4-4df1-b90c-862c8a59935f
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