Add flake8 and pylint to development install extras

.pylintrc

@@ -0,0 +1,20 @@
+[MASTER]
+# Add files or directories to the blacklist. They should be base names, not
+# paths.
+ignore=lkft
+
+[MESSAGES CONTROL]
+# Disable the message, report, category or checker with the given id(s). You
+# can either give multiple identifiers separated by comma (,) or put this
+# option multiple times (only on the command line, not in the configuration
+# file where it should appear only once). You can also use "--disable=all" to
+# disable everything first and then reenable specific checks. For example, if
+# you want to run only the similarities checker, you can use "--disable=all
+# --enable=similarities". If you want to run only the classes checker, but have
+# no Warning level messages displayed, use "--disable=all --enable=classes
+# --disable=W".
+disable=duplicate-code
+
+[REPORTS]
+# Activate the evaluation score.
+score=no

README.md

@@ -20,13 +20,14 @@ or a directory path:
     pip3 install --user .
 
 If you want to hack on the source code, install the package in the editable
-mode with the `-e/--editable` option. E.g.:
+mode with the `-e/--editable` option, and with "dev" extra included. E.g.:
 
-    pip3 install --user --editable .
+    pip3 install --user --editable '.[dev]'
 
 The latter installs kcidb executables which use the modules from the source
 directory, and changes to them will be reflected immediately without the need
-to reinstall.
+to reinstall. It also installs extra development tools, such as `flake8` and
+`pylint`.
 
 In any case, make sure your PATH includes the `~/.local/bin` directory, e.g.
 with:

setup.py

@@ -41,6 +41,12 @@
         "google-cloud-bigquery",
         "jsonschema",
     ],
+    extras_require=dict(
+        dev=[
+            "flake8",
+            "pylint",
+        ],
+    ),
     entry_points=dict(
         console_scripts=[
             "kcidb-init = kcidb.init_cmd:main",