improve update error page: remove box, make link visible, insert missing space, remove line break

Add type of the variables to the docs

skip testLongPath()

Remove triggerupdate.php & add quiet option for CLI scanner

Fix numeric storage id for cache wrapper

New DateTimeFormatter class for dates in other timezones and languages

Use UID instead of login name

Make DateTimeFormatter a service and adjust tests that have been inaccurate

Expose backend type via REST API

Add newline that was removed by 15be763d

google: delete original after successful rename

Dont return cached date in shared cache when the file doesn't exist

Use httphelper and cache response even when it is empty

Add dropTable to IDBConnection

Fix autotest no file

Fix #12227

Add an option to disallow sending sharing emails to non-owncloud users

Add getTagsForObjects in ITags

Allow autocomplete for test file in autotest.sh

Fix namespaces of encryption classes and encryption tests

This change will expose the user backend via the REST API which is a pre-requisite for https://github.com/owncloud/core/issues/12620.

For example:
````json
[{"name":"9707A09E-CA9A-4ABE-A66A-3F632F16C409","displayname":"Document Conversion User Account","groups":[],"subadmin":[],"quota":"default","storageLocation":"\/Users\/lreschke\/Programming\/core\/data\/9707A09E-CA9A-4ABE-A66A-3F632F16C409","lastLogin":0,"backend":"OCA\\user_ldap\\USER_LDAP"},{"name":"ED86733E-745C-4E4D-90CB-278A9737DB3C","displayname":"Hacker","groups":[],"subadmin":[],"quota":"default","storageLocation":"\/Users\/lreschke\/Programming\/core\/data\/ED86733E-745C-4E4D-90CB-278A9737DB3C","lastLogin":0,"backend":"OCA\\user_ldap\\USER_LDAP"},{"name":"71CDF45B-E125-450D-983C-D9192F36EC88","displayname":"admin","groups":[],"subadmin":[],"quota":"default","storageLocation":"\/Users\/lreschke\/Programming\/core\/data\/71CDF45B-E125-450D-983C-D9192F36EC88","lastLogin":0,"backend":"OCA\\user_ldap\\USER_LDAP"},{"name":"admin","displayname":"admin","groups":["admin"],"subadmin":[],"quota":"default","storageLocation":"\/Users\/lreschke\/Programming\/core\/data\/admin","lastLogin":"1418057287","backend":"OC_User_Database"},{"name":"test","displayname":"test","groups":[],"subadmin":[],"quota":"default","storageLocation":"\/Users\/lreschke\/Programming\/core\/data\/test","lastLogin":0,"backend":"OC_User_Database"}]
```