Allow non-admins to see the comments list

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I think that TICKET_CREATE and/or TICKET_VIEW should be enought to see code comments list... Or even better - additional permission type: CODE_COMMENTS_LIST

[nb]

This makes perfect sense and it should get in the next version (added it to the 1.2.0 milestone).

I like the custom permissions idea better and I will implement it, unless you beat me to it :-)