BIND 10 #327: early work on recursion

[BIND 10 Development]

#327: early work on recursion
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      Reporter:  each      |        Owner:  each                 
          Type:  defect    |       Status:  reviewing            
      Priority:  major     |    Milestone:  y2 12 month milestone
     Component:  recurser  |   Resolution:                       
      Keywords:            |    Sensitive:  0                    
Estimatedhours:  0.0       |        Hours:  0                    
      Billable:  1         |   Totalhours:  0                    
      Internal:  0         |  
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Comment(by jelte):

 I found two duplicate lines (probably re-added due to a merge mismatch)
 and removed those in r3817

 Addressed Stephen's comments in r3818, though some documentation
 descriptions may still be a bit on the sparse side, it's certainly better
 than nothing, and you are welcome to improve :)

 Addressed Likun's comments in r3819, but only the second one. The
 directory src/lib/python/isc/util contains code that is heavily used. Did
 you really mean that directory?

 Oh and I fixed a memleak reported by Jeremy that did not have a ticket (an
 object was clone()d twice) in r3820

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Ticket URL: <http://bind10.isc.org/ticket/327#comment:24>
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