DocumentCommentManager needs method "visible()"

[jMyles]

def visible(self, inquiring_user=None, node=None):
'''
Returns all comments that are visible, pursuant to their project's 
moderation settings, including those that are otherwise not visible
but for inquiring_user's authority.

Can be restricted to node.
'''

[Tikam02]

I think it's already done and someone has commented it in models.py

[stsewd]

This is part of the comments app, as mention here #2879 (comment), this issue has no relevance and must be closed.

Note: Here are some more related issues to the comment app, probably need them to be closed too.

[stsewd]

Closing this since the comments app was removed #3802