- drop permissions table and related code
- the file/folder's permission is now stored in the file cache
- BackGroundWatcher has been removed - this has meanwhile be replaced by occ files:scan which can be executed in a cron jobs
- increase version to trigger database migration
Merge pull request #8852 from owncloud/kill-permissions-master

Kill permissions table
adding PK to table encryption
adding auto increment/PK to table files_trash
adding PK to table files_trashsize
adding PK to table ldap_user_mapping and ldap_group_members
adding PK to table ldap_group_mapping
truncate permissions table to allow smooth creation of primary key
adding unit test for creating an auto increment column on a table which already contains data
remove unneeded table files_trashsizes
fix unit test