Stamps

[Adrian Buehlmann]

veracity [1] has the concept of "stamps". A stamp is like a tag (a name)
that can be applied to changesets. But a stamp differs from a tag
because the same stamp can be applied to *multiple* changesets.

Example usage: "passes test", "behavior change", "pending review"

I think this could be an interesting notion. So we might steal the idea.

Seeing recent discussions about new states and such, I thought I'll
throw this in the ring.

[1] http://www.sourcegear.com/veracity/