Add .apk mimetype.
support aes 256
update existing unit tests
add unit test for aes256/aes128
Extend OC_Util::needUpgrade to also catch app upgrades
Throw an exception when we try to load an app that needs to be upgraded
handle service not available exceptions in index, remote and public.php
extract upgrade parts to their own methods
Allow loading app without checking the upgrade
Send feedback from upgrading apps to the upgrade ui
Also set the app version when updating from app store
Set maintaince mode when updating an app from the app store
only set core version at the end
Check return of fopen() before using it

Fix #9968
Load authentication backends before tryBasicAuth
add error message if user wants to rename a file which no longer exists
no special action for folder named 'Shared' needed
no error if we try to delete a file which no longer exists
new unit test added
better check whether string resembles a DN, fixes #9887