Sc204/alg in output

The algorithm used is now mentioned in the output file names. Also, date and time are in there. Did not make a different branch for that, because that was a very small job.

umbra/model.py

@@ -137,3 +137,12 @@ class Model:
             -Wunsch
         """
         self._stats.strategy = action
+
+    def last_used_algorithm(self):
+        """Provides a string indicating which algorithm ran did the
+        last alignment.
+
+        Returns:
+            String representation of the strategy
+        """
+        return self._stats.last_used_strategy