gnubg: new features

[Isaac Keslassy]

We are happy to present three new features of gnubg on which we have 
been working quite a lot. We hope you will enjoy them.

We both find ourselves often wondering how much of the GNUBG eval is due 
to the score. Instead of repeatedly copy-pasting positions and editing 
them at various scores, we thought we could automate the process. So we 
coded new buttons for gnubg:
- Feature 1: the Money Eval button for cube decisions, which quickly 
provides an eval for the current position at money play.
- Features 2 & 3: the Score Map button for cube & move decisions, which 
show a color-coded map of all the cube decisions or best moves at 
different scores.

For more info, including images, how to download and how to help, please 
check this PDF: 
https://drive.google.com/file/d/1iTLHRmO4mG-HLcF5ZwLcqg-eWXUx8r0H/view?usp=sharing

We have tested the features for bugs a fair bit already, and will be 
continuing to do so over the next few weeks.

Enjoy!

Aaron Tikuisis & Isaac Keslassy