Ability to support Version Typing

The purpose of this need is to give the ability to ease the management of the global planning activities, such as maintenance versus release planning, or the ability to plan a Sprint targeting delivering issues assigned to a major and a maintenance release at the same time.

For instance, let's consider the following Version Types:

• Major Release
• Maintenance Release
• Sprint

We can than have the following Fix Versions and their respective types:

As opposed to the Greenhopper plugin way of managing Releases dependencies, there is no parent-children relationship between these Fix Versions. For instance, it's not unrealistic to consider a given issue assigned at the SAME TIME to V2.12 for maintenance purposes, to V3.0 for back-porting reasons to the major release and to the Sprint 4 for the team planing purpose.

Having that is place, I clearly see multiple advantages:

1- The ability to filter by Release Type (All next maintenance releases content or current and next Sprints plans)

2- Given the first point, I would see a simple way to simplify the planning board right hand view given the ability to restrict the view selected release types only.

3- In the planning board again, the ability to reschedule issues between releases of the same type while keeping the other assignment unchanged: for instance changing the Maintenance Release of an issue doesn't change its Major release and its Sprint assignment.

Last but not least, it's an elegant way of solving GHS-945