Use hash()
MD5 -> SHA1
[mms] Add 'no_gc' parameter to the Horde_Cache_Storage_File driver.
Use non-Horde global Horde_Cache driver to save Horde Registry cache
Add server specific info to cache key, in case cache files are being stored on something like NFS
[mms] Add Horde-specific prefix to filesystem cahe name to allow for easy identification.