tests: Rename test scripts, changing - to _ for consistency.

From now on, all new tests must use underscore.

Addresses issue #727.

tests/basics/try_reraise2.py

@@ -0,0 +1,32 @@
+# Reraise not the latest occured exception
+def f():
+    try:
+        raise ValueError("val", 3)
+    except:
+        try:
+            print(1)
+            raise TypeError
+        except:
+            print(2)
+            try:
+                print(3)
+                try:
+                    print(4)
+                    raise AttributeError
+                except:
+                    print(5)
+                    pass
+                print(6)
+                raise
+            except TypeError:
+                print(7)
+                pass
+            print(8)
+        print(9)
+        # This should raise original ValueError, not the most recently occurred AttributeError
+        raise
+
+try:
+    f()
+except ValueError as e:
+    print(repr(e))