cleaning up initialize()

- standardisded on a single context argument
- removed Device.init() no longer necessary as initilize now
  automatically gets propagated up the hierarchy. Renamed the existing
  use of it to "initilize".
- related pylint cleanup.

wlauto/commands/show.py

@@ -33,7 +33,7 @@ class ShowCommand(Command):
     Display documentation for the specified extension (workload, instrument, etc.).
     """
 
-    def initialize(self):
+    def initialize(self, context):
         self.parser.add_argument('name', metavar='EXTENSION',
                                  help='''The name of the extension for which information will
                                          be shown.''')