MultiOption: Replace `boost/variant` with `std::variant`
The dependence of Fit/Tools/MultiOption
on boost/variant
and boost/lexical_cast
is removed in favour of std::variant
.
Instead of Boost's lexical_cast
, the C++ std::to_string
is used and due to the change in the output for doubles, the test Fit.Unit.MinimizerOptionsTest.toOptionString
is updated.
Edited by Ammar Nejati