Make printing the activation commands optional

[ahsimb]

We don't always want to see the activation commands printed in the console. In particular, in AI-Lab they may confuse the user. She may think that they are still part of the installation routine, while the AI-Lab runs the session level activation when it opens a DB connection.

• There should be a parameter that turns the printing of the activation commands on/off. The default value should be ON.
• When printing the messages, only the session level activation command should be printed in full. Then there should be a warning, that applying a similar activation command at the system level may deactivate languages that were activated since this message was printed.