Add some useability enhancements flushed out by the 1.0 release of mussa.

Holding area for near term mussa ideas.

Documentation updates for Mussagl 1.1

For documentations tickets that don't have a specific release milestone.

There's always room for more test code, and since it's not really adding new features its less like to break things. Which are one of the reasons for phasing in new functionality.

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