STVariableCollection now inherits from QAbstractTableModel. This is to allow it to be visible in the STVariableCollectionEditor's QListView. Implemented pure virtual requirements: rowCount(), columnCount(), data().
Set the model of the QListView to be the STVariableCollection in STVariableCollectionEditor. The list of added variables now appears! (ie just the storage ring current for now). The list view selection is not yet translated into an editor selection, however. CClicking on the pv name displayed does not cause that pv's information to be displayed.