Issue #82: code comments: ability to edit comments (conservancy/kallithea)

[Thomas De Schampheleire]

New issue 82: code comments: ability to edit comments
https://bitbucket.org/conservancy/kallithea/issue/82/code-comments-ability-to-edit-comments

Thomas De Schampheleire:

Currently, an existing comment can be deleted only, not edited. 
Scenario:
- user writes a big comment using RST syntax and submits
- user then realizes a mistake, or forgot to add a review status (approved/rejected/...)

Rewriting the RST syntax is annoying, there is no way of getting the source of the original comment, and adding an extra comment to indicate the mistake/set status is not very nice.

Editing should only be possible by the original author of the comment.