Function try_parse_latlon

test/parse_coords_new.cpp:124–128

#if 0
static std::optional<g2d::Vector> try_parse_latlon(std::string_view s)
{
  auto input = latlon >> bp::eoi;
  return parse(s,input, bp::ws|bp::lit(','));
}


int main(int argc, const char* argv[])