Bug fix for cvs2fossil

I'm proud to release a new snapshot of cvs2fossil. This fixes an annoying little bug reported from the TCL/TK community.

If the first commit of a branch is in state "dead", this can be the result of two different things:

  1. The file could have been added after the branch creation and this is the first change.
  2. The file could have existed at the branch creation time and was explicitly deleted.

In the first case, the time of the commit equals the branch point, in the second case, it doesn't. The old version didn't check this and handled the second case like the first one.