Fix file name (use same naming convention)

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

src/tactic/goal_num_occurs.cpp

@@ -0,0 +1,27 @@
+/*++
+Copyright (c) 2012 Microsoft Corporation
+
+Module Name:
+
+    goal_num_occurs.cpp
+
+Abstract:
+
+
+Author:
+
+    Leonardo de Moura (leonardo) 2012-10-20.
+
+Revision History:
+
+--*/
+#include"goal_num_occurs.h"
+#include"goal.h"
+
+void goal_num_occurs::operator()(goal const & g) {
+    expr_fast_mark1   visited;
+    unsigned sz = g.size();
+    for (unsigned i = 0; i < sz; i++) {
+        process(g.form(i), visited);
+    }
+}