Allowing to sort by file name/commit msg/commit date when displaying repo content (frontend)
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### Problem to solve
It is useful to **sort**, e.g. by (commit) date, the **content in a repo**, directly from the web **frontend**.
Now the repo frontend view looks like

It would be tremendously handy to have standard buttons allowing to sort files by column.
Consider, for instance, this part of a MacOs finder window, in which the files are sorted by date (**rightmost column**).

### Intended users
Anyone using the web interface to download files selectively can benefit
### Proposal
See above
### Permissions and Security
Anyone having access to the repo should be able to sort.
issue