2004-11-23  Michael Natterer  <mitch@gimp.org>

	* app/core/gimpparasitelist.c: cosmetics, untabified.

	* libgimpbase/gimpparasiteio.[ch]: added g_return_if_fail()'s
	to all functions.

	(gimp_pixpipe_params_parse): changed "gchar*" param to "const
	gchar*" (sortof API change, but these files are most probably only
	used by GIMP itself). Still uses strtok() on the internal copy,
	but at least not on the passed string.

	* plug-ins/common/csource.c
	* plug-ins/common/gif.c
	* plug-ins/common/gih.c
	* plug-ins/common/jpeg.c
	* plug-ins/common/png.c
	* plug-ins/common/tiff.c: use parasite getters instead of
	accessing the scruct members directly. Always use g_strndup()
	instead of just g_strdup() to get strings stored in parasites
	because there is no guarantee that they are nul-terminated.