Log watcher should only show today's logs

[partsref]

As a developer, I only want to watch today's logs. Currently, if there is no file from today for a specific log, dw-utils log will tail the most recent, which doesn't help in on-going testing sessions.

It would be better to not tail a file than to tail an old file.

Possibly, there could be an option to allow files from previous days to be shown or omitted.

Or dw-utils log could continue with its current logic, but monitor the log directory, and automatically switch to watching new files as they appear.