Object Viewer: Fix: Slots are no longer shown in tree view on the Methods tab.
Bug Number: n/a
Release notes (y/n): no (new development fix)
For Release Nums: 7.1

In the development of the Object Viewer -- supporting multiple Object tabs 
in the Open Object Dialog -- much of the one-time setup code for that dialog 
needed to be made dynamic, re-executed when a different Object (from the 
Object tabs) is "installed" into the dialog's widgets.  In the course of 
repackaging of much of the widget initialization code into a new 
'installSimObj' method, the application of the 'setRootIsDecorated' property 
for three QTreeWidgets used in this dialog was incorrectly transferred. 

This applied to these three Object Viewer / Open Object Dialog QTreeWidgets:

  _methodsTreeWid   / "Methods" tab
  _accountsTreeWid  / "Accounts" tab
  _olamTreeWid      / "Accounting Methods" tab

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