Big cleanup of the ps code

Big cleanup of the ps code

2005-06-07  Marco Pesenti Gritti <mpg@redhat.com>

        * ps/ps-document.c: (ps_document_init),
        (send_ps), (get_page_box), (output), (catchPipe), (input),
        (stop_interpreter), (file_length), (file_readable),
        (check_filecompressed), (ps_document_enable_interpreter),
        (document_load), (ps_async_renderer_render_pixbuf):
        * ps/ps-document.h:

        Big cleanup of the ps code