--version for CVS Bison

[Joel E. Denny]

Before we begin committing again, I wonder if we might settle the 
--version issue that Paul (I believe) raised not too long ago.  
Specifically, which of the following should --version for CVS Bison print?

1. "2.2a"  This is not true.  There is no 2.2a yet.

2. "2.2a-cvs"  Are we sure the next release won't be 2.3 or 3.0?  Well, 
maybe we are this time, but do we know in general?

3. "2.2-cvs"  Why does our choice of CVS as the version control system 
matter?

4. "2.2-devel"  I read this as further development with 2.2 as the base.

Akim also mentioned the idea of using the ChangeLog revision.  This would 
add further precision, but how do you suggest we implement that?

Joel