1.1.3dev: Moved `group_milestones` function from `trac.ticket.model` to `trac.ticket.roadmap`. Compatibility function has been left in `trac.ticket.model` and will be removed in 1.3.1. Refs #11892.


git-svn-id: http://trac.edgewall.org/intertrac/log:/trunk@13568 af82e41b-90c4-0310-8c96-b1721e28e2e2