[elephant-ticket] #65: Proper interface for informative messages and event logging

[elephant]

#65: Proper interface for informative messages and event logging
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 Reporter:  ieslick      |       Owner:  ieslick
     Type:  enhancement  |      Status:  new    
 Priority:  trivial      |   Milestone:         
Component:  system-wide  |     Version:         
 Keywords:               |  
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 Currently we print, signal or do other things when various system events
 occur.  We should turn this into an appropriate log-level notification
 system where the user can specify the informativeness they want.  Warnings
 and above should be printed by default to help the user avoid shooting
 themselves in the foot.

 Do we want to also add basic event logging such as:
 High level:
 (created pobj of <class>: oid = foo)
 (created new repository <spec>)
 Low level:
 (wrote <key>,<value> to <btree:oid>)
 (deleted <key> from <btree:oid>)
 (slot-access to <obj:oid:class> => <value>)

 This could be done easily as around or after methods on the major
 interfaces, perhaps enabled as a reader option (rather ugly, but
 performance enhancing).  We could also just insert code into the
 appropriate places.

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Ticket URL: <http://trac.common-lisp.net/elephant/ticket/65>
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