[Cuis] New updates: Reference Finder by Andres Valloud

[Juan Vuletich]

Hi Folks,

I've just pushed to https://github.com/Cuis-Smalltalk/Cuis-Smalltalk-Dev 
some new updates and an updated image.

This bunch includes Andrés Valloud's great Reference Finder. A new menu 
in inspectors and explorers opens this new tool. It finds instantly all 
references from globals (actually from the array of special objects) to 
our subject, and opens an explorer like tool with all the shortests 
reference paths. This is muuuch faster then the old pointer explorer, 
and it is meant to replace it.

Thanks Andrés!

Please play with this, and when we are all happy, we'll remove the old 
pointer explorer from the image.

This commit also includes contributions from Germán, Ken and yours 
truly. Enjoy!

Cheers,
Juan Vuletich

Ps. Maybe when this gets a bit of testing from you all it will be a good 
time to call this "4.3" and do an official release. Thoughts?