OwnCloud issues

[jonaysanz]

Solve all owncloud related issues linked in
https://www.cageos.org/index.php?page=apps&section=Collaborative

[jonaysanz]

owncloud/core#10254
owncloud/core#10237
owncloud/core#9952
owncloud/core#9936
owncloud/core#9630
owncloud/core#9541
owncloud/core#9144
owncloud/core#9663
owncloud/core#9663
owncloud/core#9134
owncloud/core#8000
owncloud/core#106
owncloud/core#6120
owncloud/core#16525
owncloud/core#16537
owncloud/core#10901
https://www.cageos.org/index.php?page=apps&section=StorageOwnCloud#yacy
owncloud-archive/documents#487
owncloud/core#16539