Make templates aware of different owncloud editions

check if the decrypted private key is valid on login and on read/write files

Conflicts:
	apps/files_encryption/appinfo/app.php
	apps/files_encryption/lib/util.php

Fix files_encryption app upgrade from 4.5 to 5.0

Folders with multiple periods problem fix

make sure that only one process can enter the migration mode

Merge branch 'files_encryption_upgrade_fix' of github.com:owncloud/core into files_encryption_upgrade_fix

remove App management top bar and move buttons more contextually in the interface

Conflicts:
	apps/files_encryption/tests/crypt.php

Multiselect fixes

This reverts commit d2d71c87.
which was accidentally commited

move storage bar below clients showcase to make it more visible

It was not possible to download a file called "true" or "false" (caseinsensitive) when clicking the link "download" due to the result of json_decode().
Both cases are now implicitly checked.

Hotfix provided by Herbert Pophal

Init language object before using it

Introduce more robust SQL execution and exception handling

we don't want to check performance just yet. we just want to make jenkins end more reliably.

disable proxys during ssl root cert upload to avoid encryption