[sugar] adding versions to journal/datastore

[Walter Bender]

> Walter, could you elaborate on your comment?

My comment was in regard to the anticipated additional complexity we
may run into if/when we have versioning between multiple users, as
would be dictated by most of the bulletin board schemes. Not sure if
Tomeu's model will work, but it doesn't seem a bad first step.

-walter


-- 
Walter Bender
Sugar Labs
http://www.sugarlabs.org