Print attributes for ppm

src/imgio.c

@@ -237,7 +237,7 @@ inherit_from_ppm(const PPM* in)
 /** The Second image gets merged into the first.
  * The First image obtains attributes from the second image that were not found.
 */
-PPM
-merge_ppm(const PPM* in_1, const PPM* in_2) {
-        if(in) 
-}
+// PPM
+// merge_ppm(const PPM* in_1, const PPM* in_2) {
+//         if(in) 
+// }