Bots version 2.1.0

This version is the first version in one-and-a-half year.
Bots 2.0.2 proved to be quite stable.
This version adds a lot of new functionality; quite some bugs have been fixed.
This new verson is very upward compatible with version 2.0.2; some might experience a problem because of an extra grammar check; that is easily solved, see below in details.