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acl: Remove deprecated global ACL files
COPYING: Simplify and standardize copyright handling
plugins: acl - Remove old acl_backend_init()
acl: acl_backend_vfile_object_init() - Handle failures from acl_backend_vfile_get_local_dir()
acl plugin: Fix Coverity warning
acl: Add acl_dict_index setting to rebuild ACL dict without iterating the whole dict
plugins: acl - Drop unused can_see_r from acl_mailbox_list_have_right()
acl: Add acl_id_is_valid()
Initial support for LISTing users with shared mailboxes.
acl: Move attribute rights checking to its own function