remove '#include <iostream>' from headers and from unneeded places

It's harmful to have iostream everywhere as it injects functions in the compiled files

src/math/lp/lp_settings.h

@@ -24,6 +24,7 @@ Revision History:
 #include <algorithm>
 #include <limits>
 #include <iomanip>
+#include <iostream>
 #include <cstring>
 #include "util/stopwatch.h"
 #include "util/statistics.h"

src/math/lp/lu.h

@@ -33,7 +33,7 @@ Revision History:
 #include "math/lp/static_matrix.h"
 #include <string>
 #include "math/lp/numeric_pair.h"
-#include <iostream>
+#include <ostream>
 #include <fstream>
 #include "math/lp/row_eta_matrix.h"
 #include "math/lp/square_dense_submatrix.h"

src/math/lp/mps_reader.h

@@ -26,7 +26,7 @@ Revision History:
 #include <string>
 #include "util/vector.h"
 #include <unordered_map>
-#include <iostream>
+#include <ostream>
 #include <fstream>
 #include <locale>
 #include "math/lp/lp_primal_simplex.h"

src/math/realclosure/realclosure.cpp

@@ -29,6 +29,7 @@ Notes:
 #include "util/ref_vector.h"
 #include "util/ref_buffer.h"
 #include "util/common_msgs.h"
+#include <iostream>
 
 #ifndef REALCLOSURE_INI_BUFFER_SIZE
 #define REALCLOSURE_INI_BUFFER_SIZE 32

src/math/simplex/sparse_matrix.h

@@ -281,7 +281,7 @@ namespace simplex {
             vector<_row> const& m_rows;
             void move_to_next() {
                 while (m_curr < m_rows.size() && m_rows[m_curr].size() == 0) {
-                    std::cout << "size is 0 for " << m_curr << "\n";
+                    //std::cout << "size is 0 for " << m_curr << "\n";
                     ++m_curr;
                 }
             }

src/math/subpaving/subpaving_t.h

@@ -18,7 +18,7 @@ Revision History:
 --*/
 #pragma once
 
-#include<iostream>
+#include<ostream>
 #include "util/tptr.h"
 #include "util/small_object_allocator.h"
 #include "util/chashtable.h"

src/math/subpaving/tactic/subpaving_tactic.cpp

@@ -26,6 +26,7 @@ Revision History:
 #include "util/mpff.h"
 #include "util/mpfx.h"
 #include "util/f2n.h"
+#include <iostream>
 
 class subpaving_tactic : public tactic {