Don't load the apps when we need to upgrade

The loading can call functions that require new tables, like oc_jobs
introducing new dav property {xmlns:oc="http://owncloud.org/ns}id
handle case where fileid is not set
Remove WebDAV redirect from the root path

This will prevent people mounting the root path.
They should use the full webdav path instead.

Fixes #4923
Fix leftcontent/right content, fixes tasks app

Tasks app layout was broken since the controls bar is higher now.
This change should hopefully fix other apps using the same layout.
typo, fixes #5517
LDAP: when multiline values are passed as array, do not try to preg_split them. Fixes #5521
- fixing namespace
- remove property only if present
Removed old webdav endpoint
Merge pull request #5512 from owncloud/css-fixleftcontentrightcontent

Fix leftcontent/right content, fixes contacts app
LDAP Wizard: always show correct Back+Continue Buttons, fixes #5520
Merge pull request #5494 from owncloud/fixing-3593-master

introducing new dav property {xmlns:oc="http://owncloud.org/ns}id
Merge pull request #5507 from owncloud/webdav-removeredirectfromindex

Remove WebDAV redirect from the root path
Changed update message to be more instructive, changed update style to be less aggresive

Fix br tags

Improve english messages
Merge pull request #5528 from frisco82/changeUpadateNotification

Changed update message to be more instructive
LDAP: don't validate unconfigured (new) LDAP server configs, fixes #5518
Merge pull request #5532 from owncloud/ldap_fixes

Ldap fixes
make sure the shared ldap connection is rebound to the configured user after being used for password checking.
Added syntax help for autotest.sh

autotest.sh now checks for the validity of the db config name argument.
If the db config name is not known, it show syntax info.

This should save some time to people to understand how to use this
script. Before this fix, an invalid argument would return a big HTML
page in the output.
Fixed quota stream's fseek method

- Added missing return statement
- Added missing support for SEEK_END
- Fixes #5524