f1e5692 Ticket 49214 - Implement htree concept

Authored and Committed by William Brown 6 years ago
    Ticket 49214 - Implement htree concept
    
    Bug Description:  Implement the htree concept that was designed
    by wibrown.
    
    Fix Description:  Implementation of siphash1-3 and htree. The htree
    already shows improvements over the b+tree in many conditions,
    and a COW implementation will come soon.
    
    https://pagure.io/389-ds-base/issue/49214
    
    Author: wibrown
    
    Review by: mreynolds (Thanks!)
    
        
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