Conflicts:
	apps/files_versions/lib/versions.php

Part-ported filesystem operations to OC_FilesystemView
Refactored Storage class to depend on an OC_FsV object and have fewer static classes

provide multibyte aware helper functions mb_str_replace, mb_substr_replace and mb_array_change_key_case for handling with UTF 8

webdav client crashes for secure connections if he doesn't have the right root certificate for ssl verification. For the moment I print at least a useful error message to the OC log and the Apache log

check for resource