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

From now on, all new tests must use underscore.

Addresses issue #727.

tests/basics/class_staticclassmethod.py

@@ -0,0 +1,25 @@
+# test static and class methods
+
+class C:
+    @staticmethod
+    def f(rhs):
+        print('f', rhs)
+    @classmethod
+    def g(self, rhs):
+        print('g', rhs)
+
+    # builtin wrapped in staticmethod
+    @staticmethod
+    def __sub__(rhs):
+        print('sub', rhs)
+    # builtin wrapped in classmethod
+    @classmethod
+    def __add__(self, rhs):
+        print('add', rhs)
+
+c = C()
+
+c.f(0)
+c.g(0)
+c - 1
+c + 2