Add auto cleanup for logs

[Jeffreydaw]

MAny of the OceanNavigator logfiles are appended to without any file size limit or time limit on the file. The files should be set to start a new file every month or so and to save each month as it's own log file. It may also be a good plan to archive files that are over a year old.

[htmlboss]

Ideally we could have a global logging function with varying log levels, and rotating files.