Tidied up unused variables, added serialVersionUIDs as appropriate,

removed a few unnecessary casts and brackets and exceptions.

src/java/org/lwjgl/LWJGLException.java

@@ -43,6 +43,8 @@ package org.lwjgl;
  */
 public class LWJGLException extends Exception {
 
+	private static final long serialVersionUID = 1L;
+
 	/**
 	 * Plain c'tor
 	 */