updater

How does it work?

• creates backup directory under the ownCloud data directory.
• extracts update package content into the backup/packageVersion
• makes the copy of the current instance (except data dir) to backup/currentVersion-randomstring
• moves all folders except data, config and themes from the current instance to backup/tmp
• moves all folders from backup/packageVersion to the current version
• copy old config.php to the config directory.