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Under Python 3, the 'new' module for creating classes is no longer
present. Instead this operation is in the 'types' module.

There werea number of lint issues with variables which were unused in
the timer and test code. These have been replaced by '_' placeholders
where possible. Test code had lots of 'no-self-use' which is common
in the test functions.

There were some bits that were wrong, which were found when I started
writing tests for the problems.

The timer needs to be tested; might as well start doing something.

The Timer module provides the ability to interrupt after a timeout,
and time events. Multiple timers are supported.