Updated z3 version, CVC4 and smt-lib format

src/main/scala/leon/solvers/smtlib/SMTLIBCVC4CounterExampleSolver.scala

@@ -15,7 +15,7 @@ class SMTLIBCVC4CounterExampleSolver(context: LeonContext, program: Program) ext
       "--rewrite-divk",
       "--produce-models",
       "--print-success",
-      "--lang", "smt",
+      "--lang", "smt2.5",
       "--fmf-fun"
     ) ++ userDefinedOps(ctx)
   }

src/main/scala/leon/solvers/smtlib/SMTLIBCVC4ProofSolver.scala

@@ -17,7 +17,7 @@ class SMTLIBCVC4ProofSolver(context: LeonContext, program: Program) extends SMTL
     Seq(
       "-q",
       "--print-success",
-      "--lang", "smt",
+      "--lang", "smt2.5",
       "--quant-ind",
       "--rewrite-divk",
       "--conjecture-gen",

src/main/scala/leon/solvers/smtlib/SMTLIBCVC4Solver.scala

@@ -25,7 +25,7 @@ class SMTLIBCVC4Solver(context: LeonContext, program: Program) extends SMTLIBSol
 //      "--dt-rewrite-error-sel", // Removing since it causes CVC4 to segfault on some inputs
       "--rewrite-divk",
       "--print-success",
-      "--lang", "smt"
+      "--lang", "smt2.5"
     ) ++ userDefinedOps(ctx).toSeq
   }
 }

src/sphinx/installation.rst

@@ -86,7 +86,7 @@ x64, do the following:
 2. Copy ``unmanaged/common/vanuatoo*.jar`` to ``unmanaged/64/``
 
 You may be able to obtain additional tips on getting Leon to work on Windows 
-from Mikael Mayer, http://people.epfl.ch/mikael.mayer
+from [Mikael Mayer](http://people.epfl.ch/mikael.mayer) or on [his dedicated web page](http://lara.epfl.ch/~mayer/leon/),
 
 .. _smt-solvers: