use the new tiff2ps interfaces

use the new tiff2ps interfaces

2005-07-04  Matthew S. Wilson  <msw@rpath.com>

	* tiff/tiff-document.c (tiff_document_ps_export_begin)
	(tiff_document_ps_export_do_page, tiff_document_ps_export_end):
	use the new tiff2ps interfaces

	* tiff/tiff2ps.h (tiff2ps_context_new, tiff2ps_process_page)
	(tiff2ps_context_finalize): implement new interfaces for tiff2ps

	* tiff/tiff2ps.c: refactor tiff2ps code to use a context
	structure instead of global variables.  Remove use of static
	variables in functions.