cumulfimgs can now export in all know formats

tools/Makefile

@@ -19,7 +19,8 @@ fimgstats:	fimgstats.c $(DEPS)
 	gcc $(COPT) $< ../libfloatimg.a -lm -o $@
 
 cumulfimgs:	cumulfimgs.c $(DEPS)
-	gcc $(COPT) $< ../libfloatimg.a -lm -o $@
+	gcc $(COPT) $< ../libfloatimg.a -lcfitsio	\
+	-ltiff  -lpnglite -lz -lm -o $@
 
 mkfimg:		mkfimg.c  $(DEPS)
 	gcc $(COPT) $< ../libfloatimg.a -lm -o $@

tools/cumulfimgs.c

@@ -108,7 +108,8 @@ if (to_gray) {
 		}
 	}
 
-foo = fimg_dump_to_file(&accu, output_file, 0);
+// XXX foo = fimg_dump_to_file(&accu, output_file, 0);
+foo = fimg_export_picture(&accu, output_file, 0);
 if (foo) {
 	fprintf(stderr, "error %d while saving '%s'\n", foo, output_file);
 	exit(1);