R1:77b4c3145a8b

Simplify Diffusion main view

Summary:
Currently, Diffusion has very complex views. After three years I'm not really used to them and rarely use many of these options.

Simplify the browse and history views:

- Put the browse view on top.
- Move dates to the right.
- Remove "History" and "Edit" links from the browse view. You can access these actions by clicking the file/path.
- Remove "Browse" link from the history view. You can access this action by clicking the commit.
- Remove "Change Type"…