Reorganizing the code. Moved nlsat to its own directory.

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

src/nlsat/nlsat_clause.cpp

@@ -0,0 +1,49 @@
+/*++
+Copyright (c) 2012 Microsoft Corporation
+
+Module Name:
+
+    nlsat_clause.cpp
+
+Abstract:
+
+    Clauses used in the Nonlinear arithmetic satisfiability procedure. 
+
+Author:
+
+    Leonardo de Moura (leonardo) 2012-01-02.
+
+Revision History:
+
+--*/
+#include"nlsat_clause.h"
+
+namespace nlsat {
+
+    clause::clause(unsigned id, unsigned sz, literal const * lits, bool learned, assumption_set as):
+        m_id(id),
+        m_size(sz),
+        m_capacity(sz),
+        m_learned(learned),
+        m_activity(0),
+        m_assumptions(as) {
+        for (unsigned i = 0; i < sz; i++) {
+            m_lits[i] = lits[i];
+        }
+    }
+
+    bool clause::contains(literal l) const {
+        for (unsigned i = 0; i < m_size; i++)
+            if (m_lits[i] == l)
+                return true;
+        return false;
+    }
+
+    bool clause::contains(bool_var v) const {
+        for (unsigned i = 0; i < m_size; i++)
+            if (m_lits[i].var() == v)
+                return true;
+        return false;
+    }
+
+};