csv::set_decimal_places does not round decimals to width

[telmo-carmo]

csv::set_decimal_places(2);
writer << std::make_tuple(-1.043, 2.126, "Three"); // out => -1.04;2.12;Three

[vincentlaucsb]

Closing as this is the intended behavior. It is the user's responsibility to call std::round() on CSV writer inputs. I do not believe all users should be saddled with the cost of calling std::round on all floating point inputs.