[mod] pylint all files with one profile / drop PYLINT_SEARXNG_DISABLE_OPTION

In the past, some files were tested with the standard profile, others with a
profile in which most of the messages were switched off ... some files were not
checked at all.

- ``PYLINT_SEARXNG_DISABLE_OPTION`` has been abolished
- the distinction ``# lint: pylint`` is no longer necessary
- the pylint tasks have been reduced from three to two

  1. ./searx/engines -> lint engines with additional builtins
  2. ./searx ./searxng_extra ./tests -> lint all other python files

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

tests/unit/test_webapp.py

@@ -1,4 +1,5 @@
-# -*- coding: utf-8 -*-
+# SPDX-License-Identifier: AGPL-3.0-or-later
+# pylint: disable=missing-module-docstring
 
 import json
 from urllib.parse import ParseResult
@@ -11,15 +12,15 @@ from searx.preferences import Preferences
 from tests import SearxTestCase
 
 
-class ViewsTestCase(SearxTestCase):
+class ViewsTestCase(SearxTestCase):  # pylint: disable=missing-class-docstring, too-many-public-methods
     def setUp(self):
         # skip init function (no external HTTP request)
-        def dummy(*args, **kwargs):
+        def dummy(*args, **kwargs):  # pylint: disable=unused-argument
             pass
 
         self.setattr4test(searx.search.processors, 'initialize_processor', dummy)
 
-        from searx import webapp  # pylint disable=import-outside-toplevel
+        from searx import webapp  # pylint: disable=import-outside-toplevel
 
         webapp.app.config['TESTING'] = True  # to get better error messages
         self.app = webapp.app.test_client()
@@ -60,10 +61,10 @@ class ViewsTestCase(SearxTestCase):
             Timing(engine='youtube', total=0.9, load=0.6),
         ]
 
-        def search_mock(search_self, *args):
+        def search_mock(search_self, *args):  # pylint: disable=unused-argument
             search_self.result_container = Mock(
                 get_ordered_results=lambda: test_results,
-                answers=dict(),
+                answers={},
                 corrections=set(),
                 suggestions=set(),
                 infoboxes=[],
@@ -87,7 +88,8 @@ class ViewsTestCase(SearxTestCase):
 
         self.setattr4test(Preferences, 'get_value', preferences_get_value)
 
-        self.maxDiff = None  # to see full diffs
+        # to see full diffs
+        self.maxDiff = None  # pylint: disable=invalid-name
 
     def test_index_empty(self):
         result = self.app.post('/')