Add InternalComments to Copies

Copies don't currently have internal comments. We'll need them.
We only need the comments to be on the Node class

Since Work and Copy are just specialisations of Nodes
Move to 1.1.107
Merge pull request #126 from nla/hr-add-comments-to-copies

Unify comments fields
move to 1.1.108 because that's what we do now

why not???
Merge branch 'hr-add-comments-to-copies'
merged latest commit from master branch.