Think about workflow to update a template "after the fact"

[cjerdonek]

It would be nice if we had a simple workflow for the following scenario (most likely using Git):

1. Render a Groome template in a git repo using a user-specified configuration file
2. Do commits on the rendered Groome template
3. Someone improves the Groome template with new commits
4. Now we want to "update" the rendered Groome template to the new and improve source template.

One way to look at this is as follows. The sequence (3) of commits in the source Groome template can first be transformed into a sequence of rendered Groome templates (simply following/resolving the user-specified config file through the template commits and rendering the corresponding template with the config file at each commit). Then we would need to merge or rebase these simple rendered templates with the sequence of commits in (2). Ideally, this can be done incrementally/progressively (e.g. using rebase) rather than all at once.