Class SortIncreasing

code/math/linear_program_io.cpp:82–86

		// it is possible to make the order an parameter when constructing SortObj, but this is a bit more efficient 
		if (increasing_order) {
			struct SortIncreasing {
				bool operator()(const std::pair<int, double>& a, const std::pair<int, double>& b) {
					return a.first < b.first;
				}
			};
			std::sort(coeffs.begin(), coeffs.end(), SortIncreasing());
		}
		else {