Issue 638: Add support for ticket relations

Reported by Thomas Keller, Mar 18, 2011

We suffer badly from duplicates in our own tracker and we have a 
hard time tracking related issues, blocking issues and / or 
duplicates in a proper form.

Requirements:

- needed relations:
  * "is related to" (general)
  * "blocks" / "is blocked by"
  * "duplicates" / "is duplicated by"

- make more (custom) relations configurable on project level, i.e.
    X <verb1> Y, Y <verb2> X
  where <verb1> would e.g. be "blocks" and 
<verb2> would be "blocked by"

- display relations grouped by type on the issue view on the left

- record relation changes in the ticket's history

Comment 1 by Thomas Keller, May 6, 2011

The first iteration should not include support for cross-project 
links, as the access handling needs to be figured out before that.

Status: Started
Owner: tommyd

Comment 2 by Thomas Keller, May 28, 2011

Addition and display of ticket relations works as of revision 16dda07
. I still need to find a sane / nice way to edit arbitrary amounts 
of relations for existing tickets.

Relation changes also still have to be recorded somehow in the 
ticket's history.

Labels: Milestone:Release1.2

Comment 3 by Thomas Keller, May 30, 2011

Basic implementation has been finished in revision 0aa5999.

Status: Fixed

Indefero