[elephant-ticket] #48: Enable hints to optimize derived index updates

[elephant]

#48: Enable hints to optimize derived index updates
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 Reporter:  ieslick       |       Owner:  ieslick      
     Type:  defect        |      Status:  new          
 Priority:  major         |   Milestone:  Release 0.9.1
Component:  metaprotocol  |     Version:               
 Keywords:                |  
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 Add a keyword option to add-index that takes a list of dependent slots so
 that the derived index is only updated when the relevant slot is updated.

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Ticket URL: <http://trac.common-lisp.net/elephant/ticket/48>
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