Baikal: Version number leak

[jvoisin]

It would be great if Baïkal would refrain leaking its version number to non-authenticated users (eg. on the /admin page).

Rationale: this makes it easy to know if an installed version is vulnerable against vulnerabilities that have been already fixed in previous versions.

[shoeper]

Really unimportant.

[evert]

I am closing this ticket. I realize there can be some security benefits, but I don't think it's important enough to try and fix right now.