Change comments order

Created by: riyad

Changes notes order in all circumstances except for the wall.

• Notes are now oldest to newest, top to bottom (except for the project wall)
• Refactored notes.js to be able to dynamically load ordinary and reversed notes
• Properly documented notes.js
• Fixed bugs regarding the handling (especially deletion) of diff line notes
• Renamed the notes partials to be more consistently named
• Extracted notes related stuff (from rendering diffs) into new notes partials

Closes #847 (closed)

Enjoy :)