Fixed SegmentModel.count_crossovers() to include terminal_crossover connections

mrdna/segmentmodel.py

@@ -2479,7 +2479,7 @@ class SegmentModel(ArbdModel):
             for b in beads:
                 for l in b.locations:
                     if l.connection is not None:
-                        if l.connection.type_ == "crossover":
+                        if l.connection.type_ in ("crossover","terminal_crossover"):
                             count += 1
             return count