interfaces fixes and cleanups...and examples of each interface!

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diff --git a/examples/SimpleVC.java b/examples/SimpleVC.java
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+/*********************                                                        */
+/*! \file SimpleVC.java
+ ** \verbatim
+ ** Original author: mdeters
+ ** Major contributors: none
+ ** Minor contributors (to current version): none
+ ** This file is part of the CVC4 prototype.
+ ** Copyright (c) 2009, 2010, 2011  The Analysis of Computer Systems Group (ACSys)
+ ** Courant Institute of Mathematical Sciences
+ ** New York University
+ ** See the file COPYING in the top-level source directory for licensing
+ ** information.\endverbatim
+ **
+ ** \brief A simple demonstration of the Java interface
+ **
+ ** A simple demonstration of the Java interface.
+ **
+ ** To run the resulting class file, you need to do something like the
+ ** following:
+ **
+ **   java \
+ **     -classpath path/to/cvc4.jar \
+ **     -Djava.library.path=/dir/containing/libcvc4bindings_java.so \
+ **     SimpleVC
+ **
+ ** For example, if you are building CVC4 without specifying your own
+ ** build directory, the build process puts everything in builds/, and
+ ** you can run this example (after building it with "make") like this:
+ **
+ **   java \
+ **     -classpath builds/examples:builds/src/bindings/cvc4.jar \
+ **     -Djava.library.path=builds/src/bindings/.libs \
+ **     SimpleVC
+ **/
+
+import edu.nyu.acsys.CVC4.*;
+import edu.nyu.acsys.CVC4.Integer;// to override java.lang.Integer name lookup
+
+public class SimpleVC {
+  public static void main(String[] args) {
+    System.loadLibrary("cvc4bindings_java");
+
+    ExprManager em = new ExprManager();
+    SmtEngine smt = new SmtEngine(em);
+
+    // Prove that for integers x and y:
+    //   x > 0 AND y > 0  =>  2x + y >= 3
+
+    Type integer = em.integerType();
+
+    Expr x = em.mkVar("x", integer);
+    Expr y = em.mkVar("y", integer);
+    Expr zero = em.mkConst(new Integer(0));
+
+    Expr x_positive = em.mkExpr(Kind.GT, x, zero);
+    Expr y_positive = em.mkExpr(Kind.GT, y, zero);
+
+    Expr two = em.mkConst(new Integer(2));
+    Expr twox = em.mkExpr(Kind.MULT, two, x);
+    Expr twox_plus_y = em.mkExpr(Kind.PLUS, twox, y);
+
+    Expr three = em.mkConst(new Integer(3));
+    Expr twox_plus_y_geq_3 = em.mkExpr(Kind.GEQ, twox_plus_y, three);
+
+    BoolExpr formula =
+      new BoolExpr(em.mkExpr(Kind.AND, x_positive, y_positive)).
+      impExpr(new BoolExpr(twox_plus_y_geq_3));
+
+    System.out.println("Checking validity of formula " + formula + " with CVC4.");
+    System.out.println("CVC4 should report VALID.");
+    System.out.println("Result from CVC4 is: " + smt.query(formula));
+  }
+}