Create new milestone and migrate open issues to new milestone

I'm putting this here to keep track of my own needs. I'm not expecting you to implement (even if this would be nice!)

At the end of a milestone, I close the milestone, create a new one, and transfer all tasks to the new milestone. Automating all or part of that process would be nice.

Prerequisite:
* current milestone has closed tasks only in the "reported" columns
* "done" column is empty

Major steps:
* create new milestone (start and end dates as the name of the milestone, could be user supplied)
* create workboard in new milestone, copying columns from previous milestone
* move all tasks from previous to next milestone, keeping them in the same columns
* archive the previous milestone

The most time consuming task (when done manually) is moving the tasks from previous to new milestone.