Npyscreen

- The mouse is now enabled. At the moment, it is only used to switch between widgets on terminals that support
the mouse. However, any widget can now override the method .handle_mouse_event(self, mouse_event) if a more
detailed behaviour is required.

- minor bug fixes.
- introduction of two box classes, mainly intended as the base
classes for other things.

- fix display of utf-8 form names.
- fix display of utf-8 buttons.
- check display of utf-8 sliders.
- calendar widget now compatible with utf-8 except in day names.

An important release. On utf-8 enabled terminals, the library should now handle
the display and entry of utf-8/unicode strings on both python 2 and 3, with the single caveat
that multi-width characters still cause problems, because there is not a reliable way
to detect them.

I have not yet been able to test how well this works with the get_wch() function
introduced in python3.3. This is disabled for now, but should not make a difference
to most users.

This release should be considered an alpha release for version 2.

Bug fixes. Calendar is now more robust.
Menus can now be dynamically enabled and disabled.

Numerous bug fixes and improvements. The help system (apparently broken for
some time) has been fixed.