class MV is now broken

[utensil]

Due to my commit Remove circular dependencies , module mv no longer depends on module ga, but currently MV still lives in mv and calls ga.

So any examples using class MV, particularly the ones in examples/Old Format won't work and that includes some references to class MV in the new README. (My mistake......)

I have no intention to reintroduce circular dependencies or to drop support for class MV, so here's the work needed to be done:

• Create a new module that depends on ga and mv to put class MV and possibly the widely used com(), could name it legacy or deprecated (related to a179957)
• Fix any references to class MV in README or doc
• Fix examples using class MV