Use --use-heuristic for proper heuristic encoding

Instead of specifying the heuristic encoding manually, this lets the
planner define its location. This is to make sure that an incorrect
encoding isn’t applied accidentally.

configurations.yml

@@ -36,8 +36,7 @@ options:
   t0: &t0
   - "-T 0"
   heuristics: &heuristics
-  - "--heuristic=Domain"
-  - "heuristic.lp"
+  - "--use-heuristic"
   madagascarM: &madagascarM
   - "--madagascar-M"
   madagascarMp: &madagascarMp