using a consistent naming convention for naming tactic subfolders

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

src/tactic/arith/fix_dl_var_tactic.h

@@ -0,0 +1,33 @@
+/*++
+Copyright (c) 2011 Microsoft Corporation
+
+Module Name:
+
+    fix_dl_var_tactic.h
+
+Abstract:
+
+    Fix a difference logic variable to 0.
+    If the problem is in the difference logic fragment, that is, all arithmetic terms
+    are of the form (x + k), and the arithmetic atoms are of the 
+    form x - y <= k or x - y = k. Then, we can set one variable to 0.
+
+    This is useful because, many bounds can be exposed after this operation is performed.
+
+Author:
+
+    Leonardo (leonardo) 2011-12-29
+
+Notes:
+
+--*/
+#ifndef _FIX_DL_VAR_TACTIC_H_
+#define _FIX_DL_VAR_TACTIC_H_
+
+#include"params.h"
+class ast_manager;
+class tactic;
+
+tactic * mk_fix_dl_var_tactic(ast_manager & m, params_ref const & p = params_ref());
+
+#endif