Reorganizing source code. Created util dir

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>

src/util/mpq_inf.cpp

@@ -0,0 +1,42 @@
+/*++
+Copyright (c) 2006 Microsoft Corporation
+
+Module Name:
+
+    mpq_inf.cpp
+
+Abstract:
+
+    MPQ numbers with infinitesimals
+
+Author:
+
+    Leonardo de Moura (leonardo) 2011-06-28
+
+Revision History:
+
+--*/
+#include"mpq_inf.h"
+
+template<bool SYNCH>
+std::string mpq_inf_manager<SYNCH>::to_string(mpq_inf const & a) const {
+    if (m.is_zero(a.second))
+        return m.to_string(a.first);
+    
+    std::string s = "(";
+    s += m.to_string(a.first);
+    if (m.is_neg(a.second))
+        s += " -e*";
+    else
+        s += " +e*";
+    mpq tmp;
+    m.set(tmp, a.second);
+    m.abs(tmp);
+    s += m.to_string(tmp);
+    m.del(tmp);
+    s += ")";
+    return s;
+}
+
+template class mpq_inf_manager<true>;
+template class mpq_inf_manager<false>;