bpo-33855: Minimally test all IDLE modules. (GH-7689)

Create a template for minimally testing a tkinter-using module by importing it and instantiating its class(es).  Add a test file for all non-startup IDLE modules.  Edit existing files and update coverage.  This is part 1 of 3, covering the 21 autocomplete to help modules and touching 33 idlelib files.

Lib/idlelib/calltip_w.py

@@ -159,6 +159,9 @@ def _calltip_window(parent):  # htest #
     text.bind("<<calltip-hide>>", calltip_hide)
     text.focus_set()
 
-if __name__=='__main__':
+if __name__ == '__main__':
+    from unittest import main
+    main('idlelib.idle_test.test_calltips', verbosity=2, exit=False)
+
     from idlelib.idle_test.htest import run
     run(_calltip_window)