MeshTools::n_connected_components calculations #4038
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I'm not sure if this is triggering in my real problems but it was definitely screwing up my new unit tests.
We might be just *barely* connected by an arbitrary constraint matrix.
This is actually helping me track down the IGA issues I'm seeing...
I caught this when my approximated integral of error^2 turned out to be *negative* and had a square root of NaN, but in general we're not doing this integral in a nonlinear loop and we are doing it for error analysis and we can afford to be more robust.
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I added this for some IGA mesh debugging, but it may be useful for others too.