Add extract-history

[fflorent]

See the README file.

[hexaltation]

Hello,

LGTM

But i'll rename the script something like extract-grist-history.sh

Quite not short but have the advantage to be discoverable by a find . -name *grist*.sh
I'll not block if you disagree :)

[fflorent]

Thanks for your review!

It's a bit inconsistent, but most of the existing scripts are already named without mentioning grist. They are already included in a repository named grist.

What I usually do is to add a symlink of these scripts in a $HOME/bin folder. Therefore I can have them in my $PATH.

In your case, I tend to suggest to name these scripts of the form you would like. Does it make sense to you?

[hexaltation]

As said I will not block. :)
Even if I disagree.

Namespaces are one honking great idea -- let's do more of those!
Extract from *The Zen of Python, by Tim Peters*