Do not hide document byline viewlet by default

[hvelarde]

It is now controlled by the Allow anyone to view 'about' information option in the Security Settings of Site Setup.

This solves the following issues:

• document byline would be visible for anonymous users if enabled
• document byline is not visible for authenticated users as the information it provides should be accessible using the toolbar (there are some pending issues on this, but that must be the final goal)

closes #1556
refs. plone/plone.app.layout#90

[hvelarde]

@plone/framework-team this depends on plone/plone.app.layout#90 and both are ready to review and merging.

[jensens]

LGTM - after rebase this and the other pr can be merged.

[hvelarde]

do you realize all the problems we have created by trying to get rid of the document byline? almost all regressions in #957 are caused by that and I have not even mentioned the toolbar cluttering; I want the document byline back so we have time to think about how to fix those issues.

let me know if you need a PLIP.

[jensens]

i think this is a regression. at least anonymous users should see the byline if setting enabled it. regarding the toolbar there are a bunch of issues, I'd tackle that as a separate problem.

Whats the state of this PRs? I'd like to see this solved for anon.

[jensens]

I rebased and tests are running at the moment.
@hvelarde is anything missing? otherwise i'll merge if tests go green.

[jensens]

(!) to be merged with plone/plone.app.layout#90