catch unknown timezone and fall-back to UTC

Added filesApp flag as input field for files app detection

Test OC_User_Database in Test_User_Database instead of OC_User_Dummy.

* owncloud/fixing-5006-master:
  Use strict comparison === instead of ==.
  Adjust return value tests for checkPassword() to what OC_User_Example says.
  Make OC_User_Dummy::checkPassword() compatible with OC_User_Example.
  Use parent:: in Test_User_Database::getUser().
  Test_User_Backend::getUser() does not return an array, it returns a string.
  Test OC_User_Database in Test_User_Database instead of OC_User_Dummy.

User::delete should return bool

The user id has to be returned.

let admin specify timezone for log file entries

Since the files app can be reached under multiple URLs, either root,
files.php or public.php, a flag has been added to the DOM to help apps
(like file viewers) to detect whether they are currently in the files
app.

OC_App: Cache list of enabled apps

adding check isDeletable() on $sourcePath

fix upload to /Shared

updating a existing large file creates new file chunks. Therefore createFile() needs to check not only if we can write to the parent folder but also if we can update the existing file"

If a existing file in Shared/ with update permissions gets updated we need to write the .part file to a different place because we can't create new files in the Shared folder

Fixing broken chunked upload due to #4974

Remove the exception catch in OC_Config, this should be handled by a higher layer

Fix trash bin button

Fix new user avatar. Ref#5166

Added isPublic flag in files_sharing template

File conflicts dialog fixes

To make it possible for apps to find out whether they are running in
public mode, the flag "isPublic" will now be present in the DOM.

This is required to disable the editor app in public mode to fix #5059

OC6 Apache Authentication