[Cuis] New updates

[Juan Vuletich]

Hi all,

I recently included some new updates:

- Fixes to Exceptions by Andrés Valloud and Martin McClure.
- Assessments framework for testing and validation by Andrés Valloud.
- Many fixes and enhancements to Layouts, Window drawing, keyboard 
shortcuts, etc. by Luciano Notarfrancesco

Thank you very much Folks! Andrés, Luciano, please comment a bit on what 
you did, especially subtle but important behavior such as Exceptions and 
new stuff like Assessments, and the new Theme and Window Manager.

Cheers,
Juan Vuletich