Format files with black

- Format all files with black
- Update tox.ini flake8 arguments to be compatible
- Add black to requirements-extra.txt
- Reduce ignored flake8 rules and fix a few violations

core/gui/problem_table.py

@@ -1,39 +1,40 @@
 # Created By: Virgil Dupras
 # Created On: 2010-04-12
 # Copyright 2015 Hardcoded Software (http://www.hardcoded.net)
-# 
-# This software is licensed under the "GPLv3" License as described in the "LICENSE" file, 
-# which should be included with this package. The terms are also available at 
+#
+# This software is licensed under the "GPLv3" License as described in the "LICENSE" file,
+# which should be included with this package. The terms are also available at
 # http://www.gnu.org/licenses/gpl-3.0.html
 
 from hscommon.gui.table import GUITable, Row
 from hscommon.gui.column import Column, Columns
 from hscommon.trans import trget
 
-coltr = trget('columns')
+coltr = trget("columns")
+
 
 class ProblemTable(GUITable):
     COLUMNS = [
-        Column('path', coltr("File Path")),
-        Column('msg', coltr("Error Message")),
+        Column("path", coltr("File Path")),
+        Column("msg", coltr("Error Message")),
     ]
-    
+
     def __init__(self, problem_dialog):
         GUITable.__init__(self)
         self.columns = Columns(self)
         self.dialog = problem_dialog
-    
-    #--- Override
+
+    # --- Override
     def _update_selection(self):
         row = self.selected_row
         dupe = row.dupe if row is not None else None
         self.dialog.select_dupe(dupe)
-    
+
     def _fill(self):
         problems = self.dialog.app.results.problems
         for dupe, msg in problems:
             self.append(ProblemRow(self, dupe, msg))
-    
+
 
 class ProblemRow(Row):
     def __init__(self, table, dupe, msg):
@@ -41,4 +42,3 @@ class ProblemRow(Row):
         self.dupe = dupe
         self.msg = msg
         self.path = str(dupe.path)
-