[GHC] #9710: Clean up Trac versions

[GHC]

#9710: Clean up Trac versions
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              Reporter:  goldfire    |            Owner:  hvr
                  Type:  task        |           Status:  new
              Priority:  normal      |        Milestone:
             Component:  Trac & Git  |          Version:  7.8.3
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:              |       Blocked By:
  None/Unknown                       |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by hvr):

 The problem with the ordering is that Trac orders the versions by its
 associated release-date. However, not all versions have a release-date set
 (it's a bit of work to find out all historic release dates so I haven't
 filled in everything yet), in which case non-released versions are put in
 front. (Note also that `version` in Trac can be any string, i.e. not
 necessarily a dotted integer)

 Also, I'm afraid deleting old versions from the version table will render
 the remaining historic Ticket meta-data inconsistent or to the very least,
 destroy historic information.

 Ideally, the version field is used to denote the first version a bug/issue
 is known to exist in (regardless whether that version is "supported" or
 not). The milestone is used for declaring the version where the ticket is
 planned to be or was fixed. So that allows you to see the "life-span" of a
 bug quite easily right from the ticket-meta data.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9710#comment:2>
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