Fix session.py to allow suppression of the cookie (#737)

* Fix session.py to allow suppression of the cookie

There are often endpoints/targets in your web.py app where you do not want to use sessions and most importantly, you do not want a Set-Cookie header sent with the response. The Set-Cookie header invalidates your Cache-Control directives when you are caching your responses with many CDNs. This PR allows you to do session.no_cookie=True in your handler to suppress the session cookie when you do not want it.

* updates from code review

* Update __init__.py

* Update lint_python.yml

* Update session.py

* Update release.yml

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Co-authored-by: Christian Clauss <cclauss@me.com>

Release version 0.62 (#692)

Fix incorrect MANIFEST.in. (#663)

Updated the latest version in README.

Update setup.py.

Bump version number: 0.50.

Fixed the issue of len not working with the result of db query. (#554)

* Fixed the issue of len not working with the result of db query.

The earlier implentation was adding an __len__ function to the result
object and that worked fine for old-style classes. With old-style
classes gone in Python 3, that started giving trouble. Fixed it by
writing a ResultSet class and a special SqliteResultSet which doesn't
support len, but supports bool.

Fixes #547.

* cleanup of db tests.

switched to setuptools

Bumped version to 0.38 and updated ChangeLog

Added ChangeLog.