[mapguide-trac] #1029: Fix some issues in Ptr smart pointer class

[MapGuide Open Source]

#1029: Fix some issues in Ptr smart pointer class
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   Reporter:  waltweltonlair  |       Owner:  waltweltonlair
       Type:  defect          |      Status:  new           
   Priority:  high            |   Milestone:  2.2           
  Component:  General         |     Version:  2.1.0         
   Severity:  major           |    Keywords:                
External_id:                  |  
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 Our smart pointer class needs a few fixes / cleanups:

  * fix a ref count problem with the copy constructor
   * it's the same problem recently fixed with FdoPtr
   * see [https://trac.osgeo.org/fdo/ticket/331]
  * remove the null check from operator->
  * remove the Ptr constructor which takes an integer argument
   * it serves no purpose
  * remove the redundant #pragma once

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Ticket URL: <https://trac.osgeo.org/mapguide/ticket/1029>
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