Add file_path output with the absolute path of the loaded image

New STRING output (appended last so existing workflows keep their
link slots) carrying the absolute path of the file loaded this run,
alongside the existing filename output. Bump version to 1.4.0.

Closes #1.

sequential_loader.py

@@ -138,8 +138,10 @@ class SequentialImageLoader:
             }
         }
 
-    RETURN_TYPES = ("IMAGE", "MASK", "STRING", "INT", "INT")
-    RETURN_NAMES = ("image", "mask", "filename", "index", "total")
+    # file_path is declared last (newest output) so links in older saved
+    # workflows keep their slot positions.
+    RETURN_TYPES = ("IMAGE", "MASK", "STRING", "INT", "INT", "STRING")
+    RETURN_NAMES = ("image", "mask", "filename", "index", "total", "file_path")
     FUNCTION = "load"
     CATEGORY = "image"
 
@@ -162,7 +164,7 @@ class SequentialImageLoader:
             )
 
         pos = int(index) % total           # wrap around at the end
-        path = files[pos]
+        path = os.path.abspath(files[pos])
         filename = os.path.basename(path)
 
         image, mask = _load_image_tensors(path)
@@ -174,7 +176,7 @@ class SequentialImageLoader:
                 "index": pos,
                 "total": total,
             }]},
-            "result": (image, mask, filename, pos, total),
+            "result": (image, mask, filename, pos, total, path),
         }