draft updated manpage

[pljones]

Short description of changes

Review and update the Jamulus.1 manpage documentation

CHANGELOG: Review and update the Jamulus.1 manpage documentation

Context: Fixes an issue?

See jamulussoftware/jamuluswebsite#1043

Does this change need documentation? What needs to be documented and how?

This is documentation :)

Status of this Pull Request

Under discussion still. Proof of concept. I've not even got as far as reviewing against the command line options.

What is missing until this pull request can be merged?

Discussion first. Decide whether I've gone too far, not far enough, need to revert, etc.

Checklist

• I've verified that this Pull Request follows the general code principles
• I tested my code and it does what I want
• My code follows the style guide
• I waited some time after this Pull Request was opened and all GitHub checks completed without errors.
• I've filled all the content above

[gilgongo]

Not very familiar with man page conventions, but why is the "Jamulus knows four modes of operation..." section at the end and not with the "Description" section?

BTW I'm assuming the general style and approach here is going to be different from the website (eg bold use of semicolons, and terms like "Jamulus knows" etc.)