d05cf7b Update to 1.18

Authored and Committed by pghmcfc 9 years ago
    Update to 1.18
    
    - New upstream release 1.18
      - Add quote_empty attribute
      - Add database NULL documentation
      - Inherit csv attributes in csv() when called in void context
      - Micro-optimisation for combine/print (empty fields will be faster)
    
        
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