More cleanups

- Cleanup columns.py and tables
- Other misc cleanups
- Remove text_field.py from qtlib as it is not used
- Remove unused variables from image_viewer method

core/gui/exclude_list_table.py

@@ -16,7 +16,7 @@ class ExcludeListTable(GUITable, DupeGuruGUIObject):
     def __init__(self, exclude_list_dialog, app):
         GUITable.__init__(self)
         DupeGuruGUIObject.__init__(self, app)
-        self.columns = Columns(self)
+        self._columns = Columns(self)
         self.dialog = exclude_list_dialog
 
     def rename_selected(self, newname):

core/gui/ignore_list_table.py

@@ -22,7 +22,7 @@ class IgnoreListTable(GUITable):
 
     def __init__(self, ignore_list_dialog):
         GUITable.__init__(self)
-        self.columns = Columns(self)
+        self._columns = Columns(self)
         self.view = None
         self.dialog = ignore_list_dialog
 

core/gui/problem_table.py

@@ -21,7 +21,7 @@ class ProblemTable(GUITable):
 
     def __init__(self, problem_dialog):
         GUITable.__init__(self)
-        self.columns = Columns(self)
+        self._columns = Columns(self)
         self.dialog = problem_dialog
 
     # --- Override

core/gui/result_table.py

@@ -82,7 +82,7 @@ class ResultTable(GUITable, DupeGuruGUIObject):
     def __init__(self, app):
         GUITable.__init__(self)
         DupeGuruGUIObject.__init__(self, app)
-        self.columns = Columns(self, prefaccess=app, savename="ResultTable")
+        self._columns = Columns(self, prefaccess=app, savename="ResultTable")
         self._power_marker = False
         self._delta_values = False
         self._sort_descriptors = ("name", True)
@@ -190,4 +190,4 @@ class ResultTable(GUITable, DupeGuruGUIObject):
         self.view.refresh()
 
     def save_session(self):
-        self.columns.save_columns()
+        self._columns.save_columns()