Capture more notes.
Fix issue with overly lenient tag finding in 'newest-voom-ver-by-spec.
Add assert against nil versions in 'newest-voom-ver-by-spec.
Add :retag-all-repos sub-command.
Fix two issues in 'newest-voom-ver-by-spec.

There were two issues here:
  - tags for elimination were not limited to found-branch
  - tags for elimination were not limited to this ref

Both of these issues were of the same type. Unrelated tags could over
zealously prune history needed to find commits for a given proj-name +
branch + path.
Remove old debug lines.
Rework :box-add argument handling.

The new handling mechanism will apply quoted maps of constraints to
subsequent project names.

For example:

 lein voom :box-add '{:branch "master"}' my-organization/my-project

This lets us express :branch, :repo, :path and :version constraints on
a specified project.