cc @Raydiation

adding special handling of checkPrecondition() for chunked upload

Remove uneeded strip_tags

Fix #8819 sorting

Correctly use groups parameter only when its not empty

Add language parameter to public API for getL10N()

use the minimum of configured session_livetime and session.gc_maxlifetime for session hearbeat interval calculation

perm -> permissions

Fix #9756

Fix username for subadmins and only send subadmin groups

silently discard the response body, needed for apache/mod_dav and maybe ...

Fix #9748

Fix #9745

check if $tables is an array

Make MySQL affected row count consistent with other DBMSes

* owncloud/mysql-affectedrows:
  Added test of OCS privatedata to trigger key duplication
  Document why we have to check with defined() first.
  Make MySQL return "number of found rows" instead of number of "affected rows".

do not show selected groups twice after user creation

This `strip_tags` seems to be completely unneeded and will cause problems with passwords containing stripped characters. (e.g. `<` or `>`)

Needs https://github.com/owncloud/core/pull/9735 to be merged first.

[OC 7] IE8 styling fixes

Pass existing Net_SFTP object into Net_SFTP_Stream.

LDAP Active Directory Primary Groups support depends on bcmath module

- fixed missing scrollbar in personal page
- fixed controls bar transparency: opaque white in IE8
- fixed files table borders in IE8

SFTP: login() must be called after getServerPublicHostKey().