ChildTicketsPlugin: Allow Description to be hidden

[Geert]

In revisions r18118 and r18119 for ticket #13774 a change was made to always show the Description in the list of child tickets. This causes the list of child tickets to be cluttered and almost impossible to navigate for tickets with many child tickets and long Descriptions.

We require our developers to put in a lot of information in the Description when they enter a defect ticket, in particular 'steps to reproduce the problem'. So the person assigned to fix the ticket has all the required information.

We have tickets with 30+ child tickets that now span dozen of pages if you open the list of child tickets. In the older version of this plugin (version 2.5.6.dev0) we had a nice ordered list of tickets:

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Please allow the Description to be hidden and also don't show the text (Rest of the child ticket tree is hidden) for even less cluttering.