Allow to set level of logs

Piotr Batkorequested to merge
pbatko/allow-to-set-stdout-logs-level into master

It affects both, logs printed on stdout and written to file last_run.log.

Now user can enable debug logs (and others) in with syntax:

tt.logger.set_level(tt.logger.level.DEBUG)

Please review: @kmochocki @mzebrak

Edited by Piotr Batko

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