Implements `which`

-like functionality for a `big.matrix`

,
with additional options for efficient comparisons (executed in C++);
also works for regular numeric matrices without the memory overhead.

`signature(x = "big.matrix", cols = "ANY", vals = "ANY", comps = "ANY", op = "character")`

...

`signature(x = "big.matrix", cols = "ANY", vals = "ANY", comps = "ANY", op = "missing")`

...

`signature(x = "matrix", cols = "ANY", vals = "ANY", comps = "ANY", op = "character")`

...

`signature(x = "matrix", cols = "ANY", vals = "ANY", comps = "ANY", op = "missing")`

...

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