util.js: timestamp() method should work also when window.output.baseMillis is not set.
util.js: timestamp() method should work also when window.output.baseMillis is not set.

For example testdoc uses timestamp() but does not use baseMillis.

Update issue 1286
Status: Started
Fixed generating timestamps.

userzimmermann/robotframework-python3,userzimmermann/robotframework-python3,userzimmermann/robotframework-python3,userzimmermann/robotframework-python3,userzimmermann/robotframework-python3