[Users] Maintaining old releases

Hi,

The Einstein Toolkit has releases every six months or so which are tested and tagged so that people can download a working version. However, some things change (for example machine configurations and directory locations) which mean that the old releases don't work any more.

How should we solve this problem? One proposal would be to check every commit and decide if it needs to be backported to old releases. This would only happen if the old release would no longer work without the commit (or maybe if the bug was very important?). How many releases should be backported to? Just the last one?

This issue is probably only really applicable to simfactory machine configurations and optionlists.