* fixes #13460

There are a lot of clients that support multiple WebDAV accounts in the same application. However, they resent all the cookies they received from one of the accounts also to the other one. In the case of ownCloud this means that we will always show the user from the session and not the user that is specified in the basic authentication header.

This patch adds a workaround the following way:

1. If the user authenticates via the Sabre Auth Connector add a hint to the session that this was authorized via Basic Auth (this is to prevent logout CSRF)
2. If the request contains this hint and the username specified in the basic auth header differs from the one in the session relogin the user using basic auth

Fixes https://github.com/owncloud/core/issues/11400 and https://github.com/owncloud/core/issues/13245 and probably some other issues as well.

This requires proper testing also considering LDAP / Shibboleth and whatever instances.

minimum browser window width ≈ 1280px

as expected with inline-block span

In file lists with no selection checkbox, the CSS selector is different.
The thumbnail also needs position:absolute and a z-index to be displayed
above the row's grey highlight.

on src change

`$dir` may for example very well not get passed at well.

From within a shared/public directory, when drilling down folders, some
users want to be able to download what they're currently looking at, not
the whole shared folder. The whole archive is always a click away anyway
since a user can click on the home button.

This conversions are actually totally unneeded and probably left-overs from ages where the safe_mode was still a valid thing.

set accept to 1 (=true) for all server-to-server shares on update, at this point in time all shares are created by the first version of server-to-server sharing and are accepted if they were added to the table