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Add fold/6 helper for singleton-storage

• clean messages

• Optional Transactional kvs:add (no need to feed server)
• Fix Tables dependencies for core schema

• DETS mnesia backend
• Versionig fixes
• Table Rotation

• SQL backend added

• Improved MongoDB compatibility
• Erlang 18 compatibility
• Minor fixes

• New kvs:fold traversal memory freee function
• New kvs:link split from kvs:add
• Riak client
• Multiple Simultaneous Backend #kvs{mod=store_mnesia}
• #user.avatar replaced with #user.images
• New Core Tables #oepration/#log for transaction logs
• Redis Backend by @m-2k
• SQL Backend by @ElMaxo
• Mnesia async_dirty as default for Mnesia Backend

KVS users:

• N2O Review Application
• SpawnProc
• Erlach