Use logging system

[bengtmartensson]

Candidates are, e.g. java.util.logging.Logger ~or log4j~.

[bengtmartensson]

On hold for IrpTransmogrifier.

[bengtmartensson]

IrpTransmogrifier uses java.util.logging.Logger, but not very efficiently...

Can use something like Options -> Debug -> Debug Code... for letting the user entering logger configurations.

[bengtmartensson]

In the current stage of the project, this does not make sense any longer. Closing.