Missing functionality

[Tomaz Canabrava]

This is a missing functionality on the 4.2 that I'v talked to dirk and we
decided that it was better to implement it now before waiting for 4.3
because things can get messy if a user adds the wrong pictures on the dive.

So, possibility to remove pictures on the dive now.
Now that I'v mastered 'git rebase squash', I'll have so much less commits
=p , 9 became 3.
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